Follow-up from "Docs: Merge EE doc/user/admin_area to CE"

The following discussions from !27869 (merged) should be addressed:

• @axil started a discussion:

  We need to put back those periods. Resolve in a new MR.

• @axil started a discussion:

  Remove extra line. Resolve in a new MR.

• @axil started a discussion:

  We need the **[FREE ONLY]*** badge here. Resolve in a new MR.

  https://docs.gitlab.com/ee/development/documentation/styleguide.html#product-badges