GitLab

     Change to match my personal style as used in this repository better:

 - In 'References' under 'Useful Links:'
   - Remove @dnsmichi's first HTML comment.  (Merge into my rewrite of his la-
     ter, second comment.)
   - Revert the reference-style link pointing to the HP ZBook 17 G6's Mainte-
     nance and Service Guide back to how I had it in an earlier commit.
 - At the end of this file:
   - Replace @dnsmichi's second HTML comment with one written by me how I would
     compose it.
   - For the reference-style link target:
     - Use 'French' spacing after the colon.
     - Restore its link description.