Clarify final reconfigure/restart steps for GitLab integration

What does this MR do?

This MR attempts to provide clarity about whether the user should reconfigure or restart GitLab as the final step of their integration process. If this wording works, it may be worth revisiting the other integration pages to use this wording for consistency and to ensure we have helpful wording in place throughout.

I also made a couple of slight revisions on a couple of the preceding steps, to better indicate that they were command line values, and revised the follow-on paragraph after the process, for some cleanup and right-hand spacing (but no content changes).

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