Fix inaccurate parameter description

[gongmax]

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:
Fix the inaccurate parameter description according to https://github.com/googleforgames/agones/blob/main/install/helm/agones/templates/service/allocation.yaml#L256-L259

Which issue(s) this PR fixes:

Closes #

Special notes for your reviewer:

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gongmax, markmandel

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• OWNERS [markmandel]

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[agones-bot]

Build Failed 😱

Build Id: bf076540-147c-49c9-87f4-187ce8a74002

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• Cloud Build log download

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[markmandel]

That's a weird flake I haven't seen before:

standard-e2e-test-cluster-1-26

Release "agones" does not exist. Installing it now.
Error: release agones failed, and has been uninstalled due to atomic being set: services "agones-ping-udp-service" not found
make: *** [Makefile:426: install] Error 1

[agones-bot]

Build Succeeded 👏

Build Id: 72c86d1c-fc88-4d5d-b3ad-d9578a3e267f

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:1.34.0-dev-195cc92-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.34.0-dev-195cc92-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.34.0-dev-195cc92-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.34.0-dev-195cc92-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.34.0-dev-195cc92-amd64
• Linux C++ SDK (build): agonessdk-1.34.0-dev-195cc92-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.34.0-dev-195cc92-amd64.zip

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

• https://195cc92-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3321/head:pr_3321 && git checkout pr_3321
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.34.0-dev-195cc92-amd64

[google-oss-prow]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: 5bd271ce-f3ba-43e8-aabb-0a68cdc0226a

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:1.34.0-dev-ef9fe90-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.34.0-dev-ef9fe90-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.34.0-dev-ef9fe90-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.34.0-dev-ef9fe90-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.34.0-dev-ef9fe90-amd64
• Linux C++ SDK (build): agonessdk-1.34.0-dev-ef9fe90-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.34.0-dev-ef9fe90-amd64.zip

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

• https://ef9fe90-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3321/head:pr_3321 && git checkout pr_3321
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.34.0-dev-ef9fe90-amd64