Improve documentation to run performance script

[vicentefb]

What type of PR is this?

Uncomment only one /kind <> line, press enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking
/kind bug
/kind cleanup
/kind documentation
/kind feature
/kind hotfix
/kind release

What this PR does / Why we need it:
There were no setup steps on how to run the performance-test.sh and tune its parameters.

Which issue(s) this PR fixes:

Closes #

Special notes for your reviewer:

[agones-bot]

Build Succeeded 🥳

Build Id: 980fcd0-0ae8-4101-ade2-63af9a80435c

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.43.0-dev-953bfa8
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-953bfa8
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-953bfa8-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-953bfa8
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-953bfa8
• Linux C++ SDK (build): agonessdk-1.43.0-dev-953bfa8-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-953bfa8.zip

A preview of the website (the last 30 builds are retained):

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To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3948/head:pr_3948 && git checkout pr_3948
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-953bfa8

[agones-bot]

Build Succeeded 🥳

Build Id: 9d6af8a6-dbef-4ed4-a119-465a3349caae

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.43.0-dev-9d91f12
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-9d91f12
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-9d91f12-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-9d91f12
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-9d91f12
• Linux C++ SDK (build): agonessdk-1.43.0-dev-9d91f12-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-9d91f12.zip

A preview of the website (the last 30 builds are retained):

• https://9d91f12-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3948/head:pr_3948 && git checkout pr_3948
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-9d91f12

[agones-bot]

Build Succeeded 🥳

Build Id: bca92723-6e28-4984-a002-b9336ed128c5

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.43.0-dev-1d92c46
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-1d92c46
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-1d92c46-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-1d92c46
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-1d92c46
• Linux C++ SDK (build): agonessdk-1.43.0-dev-1d92c46-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-1d92c46.zip

A preview of the website (the last 30 builds are retained):

• https://1d92c46-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3948/head:pr_3948 && git checkout pr_3948
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-1d92c46

[agones-bot]

Build Succeeded 🥳

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The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.43.0-dev-88b95c0
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-88b95c0
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-88b95c0-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-88b95c0
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-88b95c0
• Linux C++ SDK (build): agonessdk-1.43.0-dev-88b95c0-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-88b95c0.zip

A preview of the website (the last 30 builds are retained):

• https://88b95c0-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3948/head:pr_3948 && git checkout pr_3948
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-88b95c0

[agones-bot]

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[agones-bot]

Build Succeeded 🥳

Build Id: 636a7da6-2576-4a23-9d55-7746ddbecd6c

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.43.0-dev-7fd57c0
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-7fd57c0
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-7fd57c0-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-7fd57c0
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-7fd57c0
• Linux C++ SDK (build): agonessdk-1.43.0-dev-7fd57c0-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-7fd57c0.zip

A preview of the website (the last 30 builds are retained):

• https://7fd57c0-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3948/head:pr_3948 && git checkout pr_3948
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-7fd57c0

[agones-bot]

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Build Id: 53f02f68-ced4-4448-93b5-c43a37caf722

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.43.0-dev-15db116
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-15db116
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-15db116-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-15db116
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-15db116
• Linux C++ SDK (build): agonessdk-1.43.0-dev-15db116-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-15db116.zip

A preview of the website (the last 30 builds are retained):

• https://15db116-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3948/head:pr_3948 && git checkout pr_3948
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-15db116

[agones-bot]

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The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.43.0-dev-b46c31e
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-b46c31e
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-b46c31e-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-b46c31e
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-b46c31e
• Linux C++ SDK (build): agonessdk-1.43.0-dev-b46c31e-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-b46c31e.zip

A preview of the website (the last 30 builds are retained):

• https://b46c31e-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3948/head:pr_3948 && git checkout pr_3948
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-b46c31e

[agones-bot]

Build Succeeded 🥳

Build Id: 19a07859-0b75-4029-92e5-8043f3ded22e

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.43.0-dev-cec736c
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-cec736c
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-cec736c-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-cec736c
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-cec736c
• Linux C++ SDK (build): agonessdk-1.43.0-dev-cec736c-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-cec736c.zip

A preview of the website (the last 30 builds are retained):

• https://cec736c-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3948/head:pr_3948 && git checkout pr_3948
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-cec736c