Rust fmt Documentation

Review Request #11306 — Created Nov. 25, 2020 and submitted — Latest diff uploaded

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ReviewBot
master
d13e3de...

Reviewers

This commit includes documentation for the rustfmt Tool:
https://reviews.reviewboard.org/r/11305/

Manual testing was done using make html to verify that the .rst files
are being correctly generated into .html and that all links are
working.