doc: consolidate Collaborator status in GOVERNANCE

Consolidate Collaborator status material in GOVERNANCE.md.

PR-URL: #27128
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>

GOVERNANCE.md

@@ -52,9 +52,8 @@ Typical activities of a Collaborator include:
 * Participation in working groups
 * Merging pull requests
 
-The TSC periodically reviews the Collaborator list to identify inactive
-Collaborators. Past Collaborators are typically given _Emeritus_ status. Emeriti
-may request that the TSC restore them to active status.
+The TSC can remove inactive Collaborators or provide them with _Emeritus_
+status. Emeriti may request that the TSC restore them to active status.
 
 ## Technical Steering Committee