doc: ctc -> tsc in collab guide

PR-URL: #15590
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

COLLABORATOR_GUIDE.md

@@ -285,8 +285,8 @@ introduces the new core module.
 Pull requests introducing new core modules:
 
 * Must be left open for at least one week for review.
-* Must be labeled using the `ctc-review` label.
-* Must have signoff from at least two CTC members.
+* Must be labeled using the `tsc-review` label.
+* Must have signoff from at least two TSC members.
 
 New core modules must be landed with a [Stability Index][] of Experimental,
 and must remain Experimental until a semver-major release.