Fix a link to the website.

[roberthbailey]

What type of PR is this?

Uncomment only one /kind <> line, hit 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: Fix a broken link.

Special notes for your reviewer:

https://agones.dev/site/docs/advanced/allocator-service returns a 404. https://agones.dev/site/docs/advanced/allocator-service/ takes us to the correct page.

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [markmandel,roberthbailey]

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[markmandel]

This will likely fail e2e, just because I'm updating the default nodepool. Just a heads up.

[agones-bot]

Build Failed 😱

Build Id: f8143f17-9c63-4329-86c6-66bd514fd771

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[agones-bot]

Build Failed 😱

Build Id: dbbdf1fd-f4a7-4e17-adaf-48bb3876f9b5

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[agones-bot]

Build Failed 😱

Build Id: f108bce7-8553-41e0-83cb-1c20a5af950f

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[agones-bot]

Build Failed 😱

Build Id: 81ac7d23-659a-4461-b1ef-c2e473b115e5

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[agones-bot]

Build Failed 😱

Build Id: df84031e-fdf3-4dee-a684-2a420d53c2e7

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[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: 6ed6c66c-c4cd-41a1-b493-da1230adac08

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

• image: gcr.io/agones-images/agones-controller:1.13.0-2acbb11
• image: gcr.io/agones-images/agones-sdk:1.13.0-2acbb11
• image: gcr.io/agones-images/agones-ping:1.13.0-2acbb11
• Linux C++ SDK (build): agonessdk-1.13.0-2acbb11-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.13.0-2acbb11.zip

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

• https://2acbb11-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2017/head:pr_2017 && git checkout pr_2017
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.13.0-2acbb11