Docs state crictl is ga

[jonas27]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

This is a minor fix stating in the docs that crictl is GA (not beta) since version v1.11.1.
Feel free to make suggestions for better wording.

Which issue(s) this PR fixes:

Fixes #1330

Special notes for your reviewer:

Does this PR introduce a user-facing change?

No

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[haircommander]

/approve
LGTM, thanks!

[jonas27]

@haircommander please approve again (I think I needed to squash commits)

[SergeyKanzhelev]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: haircommander, jonas27, SergeyKanzhelev

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