Fix a link on the FAQ that was pointed at localhost

[roberthbailey]

What type of PR is this?

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/kind breaking
/kind bug

/kind cleanup

/kind documentation
/kind feature
/kind hotfix

What this PR does / Why we need it:

Which issue(s) this PR fixes:

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[agones-bot]

Build Failed 😱

Build Id: 13720b3e-804e-4134-89e3-e897511408b1

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[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[agones-bot]

Build Succeeded 👏

Build Id: a363cf0c-040c-4de6-af26-314abcaf335b

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

• image: gcr.io/agones-images/agones-controller:1.18.0-972816d
• image: gcr.io/agones-images/agones-ping:1.18.0-972816d
• Linux C++ SDK (build): agonessdk-1.18.0-972816d-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.18.0-972816d.zip

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

• https://972816d-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2275/head:pr_2275 && git checkout pr_2275
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.18.0-972816d