doc: streamline Accepting Modifications in Collaborator Guide

Editing a sentence I missed simplifying in the last pass on that
section.

PR-URL: nodejs#24807
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>

COLLABORATOR_GUIDE.md

@@ -94,9 +94,8 @@ to land but is [author ready](#author-ready-pull-requests), add the
 ## Accepting Modifications
 
 Contributors propose modifications to Node.js using GitHub pull requests. This
-is true for all modifications including those proposed by TSC members and other
-Collaborators. A pull request must pass code review and CI before landing into
-the codebase.
+includes modifications proposed by TSC members and other Collaborators. A pull
+request must pass code review and CI before landing into the codebase.
 
 ### Code Reviews