Review Request #12848 — Created Feb. 25, 2023 and submitted
This cleans up the docs for upgrading Review Board and site directories.
Most of these changes are pretty minimal, involving:
The "Troubleshooting Upgrades" section has been removed, as it's no
longer applicable. There is a blurb at the right upgrade step to give
users direction if upgrades fail, though.
Built the docs and read through them. Checked for spelling errors,
bad links, and build errors.