Corrected spelling error: Issue #2293

[vaibhavp1964]

Corrected spelling error in site documentation.

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

What this PR does / Why we need it:

Which issue(s) this PR fixes:

Closes #2293

Special notes for your reviewer:

[agones-bot]

Build Failed 😱

Build Id: 84cb8db2-1a11-4db3-a9e1-d9d51b9baf14

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[roberthbailey]

Look like I flaky test (I filed an issue).

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: roberthbailey, vaibhavp1964

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[agones-bot]

Build Succeeded 👏

Build Id: 4fa0e3b3-b22d-443b-a6ba-293e31f4c140

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

• image: gcr.io/agones-images/agones-controller:1.18.0-a21b55f
• image: gcr.io/agones-images/agones-ping:1.18.0-a21b55f
• Linux C++ SDK (build): agonessdk-1.18.0-a21b55f-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.18.0-a21b55f.zip

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

• https://a21b55f-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2294/head:pr_2294 && git checkout pr_2294
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.18.0-a21b55f

[roberthbailey]

Even though we are in code freeze, since this is a fix to the website I'm going to merge it.