doc: revise Collaborator description in GOVERNANCE.md

* Active voice
* Remove Node.js Foundation mention. It may be appropriate to add
  something back in when the new foundation is bootstrapped. We
  don't control membership criteria, so best to link to something else
  when it becomes available rather than make guarantees in this doc.

PR-URL: nodejs#27071
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

GOVERNANCE.md

@@ -14,13 +14,9 @@
 
 ## Collaborators
 
-The [nodejs/node][] GitHub repository is maintained by Node.js Core
-Collaborators. Upon becoming Collaborators, they:
-
-* Become members of the @nodejs/collaborators team
-* Gain individual membership of the Node.js foundation
-
-Their privileges include but are not limited to:
+Node.js Core Collaborators maintain the [nodejs/node][] GitHub repository.
+The GitHub team for Node.js Core Collaborators is @nodejs/collaborators. Their
+privileges include but are not limited to:
 
 * Commit access to the [nodejs/node][] repository
 * Access to the Node.js continuous integration (CI) jobs