Minor cleanup on reserved diagram

[markmandel]

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:

I noticed this, and it bugged me, so I fixed it.

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

N/A

[agones-bot]

Build Succeeded 👏

Build Id: ec50d065-c525-4ad8-8471-0da355c1463a

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-c9519d3
• image: gcr.io/agones-images/agones-ping:1.18.0-c9519d3
• Linux C++ SDK (build): agonessdk-1.18.0-c9519d3-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.18.0-c9519d3.zip

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

• https://c9519d3-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2281/head:pr_2281 && git checkout pr_2281
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.18.0-c9519d3

[roberthbailey]

It took me a minute to figure out this even changed, but I found it.

[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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