Fix text and markdown

What does this MR do?

Ports https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24446 to EE.

Please merge this one first.

Author's checklist

• 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

Review checklist

• Technical writer's review (required)
• Merge the EE-MR first, CE-MR afterwards