Follow-up from "Docs: Fix markdown to reduce number of kramdown warnings (part 1b)"

The following discussions from !30246 (merged) should be addressed:

• @eread started a discussion:

  Why did we indent?

• @eread started a discussion:

  Why did we indent?

• @eread started a discussion:

  We usually prefer issues, if possible: https://gitlab.com/gitlab-org/gitlab-ee/issues/5023.

• @eread started a discussion:

  I think this is a better link: https://gitlab.com/gitlab-org/gitlab-ce/issues/55057.