Fix broken forc command docs

[JoshuaBatty]

Description

I noticed that the command section for forc in the documentation was only showing headings and no information about the commands themselves. See below.

This was due to back ticks being placed around the heading in #5369. I've removed these ticks and added the commands to the list of accepted words.

Also there were a lot of commands being missed due to their no longer being subcommands, this logic has been updated and all the forc commands are now being parsed.

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[sdankel]

Thanks!