Fix typo in examples/simple-game-server/README.md

[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
/kind release

What this PR does / Why we need it:

Fixed typo, and also cleaned up the table Markdown formatting.

Which issue(s) this PR fixes:

Originally referenced in #3319

Special notes for your reviewer:

N/A

[agones-bot]

Build Succeeded 👏

Build Id: 4a61cb88-7a89-4dda-a698-93f6b2ebcce3

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

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.35.0-dev-b6b31d4-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.35.0-dev-b6b31d4-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.35.0-dev-b6b31d4-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.35.0-dev-b6b31d4-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.35.0-dev-b6b31d4-amd64
• Linux C++ SDK (build): agonessdk-1.35.0-dev-b6b31d4-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.35.0-dev-b6b31d4-amd64.zip

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

• https://b6b31d4-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3398/head:pr_3398 && git checkout pr_3398
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.35.0-dev-b6b31d4-amd64

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [markmandel]

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[google-oss-prow]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: 9978d8d5-b8ac-43d4-9fbd-912339da7343

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

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.35.0-dev-6d50cd7-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.35.0-dev-6d50cd7-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.35.0-dev-6d50cd7-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.35.0-dev-6d50cd7-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.35.0-dev-6d50cd7-amd64
• Linux C++ SDK (build): agonessdk-1.35.0-dev-6d50cd7-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.35.0-dev-6d50cd7-amd64.zip

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

• https://6d50cd7-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3398/head:pr_3398 && git checkout pr_3398
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.35.0-dev-6d50cd7-amd64