Edit pass after addition of max_workers_per_thread_percent
Edit pass after addition of max_workers_per_thread_percent

Summary:
- Edited the description for the new argument:

          max_workers_per_thread_percent

- Changed the reference to `sh_binary` from textual to a hyperlink.

- Numerous other edits and formatting changes.

Reviewed By: davidaurelio

fbshipit-source-id: d92b1c4

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