Fix 404 in AWS/EKS documentation

[markmandel]

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:
404 was breaking CI.

I found the medium version of the same article 🤷 weird, but good for us.

Which issue(s) this PR fixes:
N/A

Special notes for your reviewer:

Unclog's CI.

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [aLekSer,markmandel,roberthbailey]

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[agones-bot]

Build Succeeded 👏

Build Id: a9f6d702-71ad-49c0-b661-5bc5efab3429

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

• image: gcr.io/agones-images/agones-controller:1.9.0-96e7ae7
• image: gcr.io/agones-images/agones-sdk:1.9.0-96e7ae7
• image: gcr.io/agones-images/agones-ping:1.9.0-96e7ae7
• Linux C++ SDK (build): agonessdk-1.9.0-96e7ae7-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.9.0-96e7ae7.zip

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

• https://96e7ae7-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1820/head:pr_1820 && git checkout pr_1820
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.9.0-96e7ae7