Update the cluster docs for Knative
What does this MR do?
Fix some wrong versioning and markdown in the new Knative docs.
Related issues
Introduced in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22593/diffs#7fe98eec40e4e9b2adb6c343b19e1e307b8059e8
Author's checklist
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Apply the correct labels and milestone -
Port the MR to EE (or backport from CE): always recommended, required when the ee-compat-check
job fails https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/8465
Review checklist
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Your team's review (required) -
PM's review (recommended, but not a blocker) -
Technical writer's review (required) -
Merge the EE-MR first, CE-MR afterwards https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/8465
Edited by Marcia Ramos