[docs] examples allocator fixed link (without / it did no resolved)

[dzmitry-lahoda]

No description provided.

[agones-bot]

Build Succeeded 👏

Build Id: a5426609-4500-46af-a57f-9cb0b14ee42c

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

• image: gcr.io/agones-images/agones-controller:1.17.0-5f31236
• image: gcr.io/agones-images/agones-ping:1.17.0-5f31236
• Linux C++ SDK (build): agonessdk-1.17.0-5f31236-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.17.0-5f31236.zip

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

• https://5f31236-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2211/head:pr_2211 && git checkout pr_2211
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.17.0-5f31236

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dzmitry-lahoda, roberthbailey

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• OWNERS [roberthbailey]

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[roberthbailey]

Thanks for the fix!