Remove experimental callout on GRPCRoute guide.

[blake]

GRPCRoute is GA and has been included in the standard channel since v1.1.0.

What type of PR is this?
/kind documentation

What this PR does / why we need it:

Removes the experimental callout on GRPCRoute guide because is now GA and included in the standard channel as of 1.1.0.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: blake / name: Blake Covarrubias (4e37d70)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @blake. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[robscott]

/check-cla

[youngnick]

/ok-to-test

[k8s-ci-robot]

@blake: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gateway-api-verify	4e37d70	link	true	/test pull-gateway-api-verify

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.