Updating code documentation for Labels

[domgreen]

What type of PR is this?

/kind documentation

What this PR does / Why we need it:

Corrects code comments around the prefix that is added by SetLabel and SetAnnotation.

Also changes the SDKMock in go to add the prefix in the tests.

Which issue(s) this PR fixes:

Link to #2057 #2053

Special notes for your reviewer:

You all rock!

[agones-bot]

Build Succeeded 👏

Build Id: 871ff4fe-f4cd-4c78-9b70-6c30b691f21b

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

• image: gcr.io/agones-images/agones-controller:1.14.0-ce9dcf3
• image: gcr.io/agones-images/agones-ping:1.14.0-ce9dcf3
• Linux C++ SDK (build): agonessdk-1.14.0-ce9dcf3-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.14.0-ce9dcf3.zip

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

• https://ce9dcf3-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2060/head:pr_2060 && git checkout pr_2060
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.14.0-ce9dcf3

[markmandel]

Looks like an excellent change to me!

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [markmandel]

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[agones-bot]

Build Succeeded 👏

Build Id: 9ae3a04f-8c01-4965-aa32-664f4573c500

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

• image: gcr.io/agones-images/agones-controller:1.14.0-1279400
• image: gcr.io/agones-images/agones-ping:1.14.0-1279400
• Linux C++ SDK (build): agonessdk-1.14.0-1279400-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.14.0-1279400.zip

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

• https://1279400-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2060/head:pr_2060 && git checkout pr_2060
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.14.0-1279400

[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: ae446210-28d2-4d0c-a919-8e9adec8822a

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

• image: gcr.io/agones-images/agones-controller:1.14.0-6375be6
• image: gcr.io/agones-images/agones-ping:1.14.0-6375be6
• Linux C++ SDK (build): agonessdk-1.14.0-6375be6-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.14.0-6375be6.zip

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

• https://6375be6-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2060/head:pr_2060 && git checkout pr_2060
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.14.0-6375be6