doc: clarify fast-track of reversions

PR-URL: #17332
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

Author: refack

COLLABORATOR_GUIDE.md

@@ -127,7 +127,7 @@ can be fast-tracked and may be landed after a shorter delay:
 * Focused changes that affect only documentation and/or the test suite.
   `code-and-learn` and `good-first-issue` pull requests typically fall
   into this category.
-* Changes that revert commit(s) and/or fix regressions.
+* Changes that fix regressions.
 
 When a pull request is deemed suitable to be fast-tracked, label it with
 `fast-track`. The pull request can be landed once 2 or more collaborators