doc: clarify collaborators & ctc members relationships

inspired by this conversation
#7183 (comment)

PR-URL: #7996
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Сковорода Никита Андреевич <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>

Author: yorkie

README.md

@@ -319,8 +319,9 @@ more information about the governance of the Node.js project, see
 * [zkat](https://github.com/zkat) -
 **Kat Marchán** <[email protected]>
 
-Collaborators & CTC members follow the [COLLABORATOR_GUIDE.md](./COLLABORATOR_GUIDE.md) in
-maintaining the Node.js project.
+Collaborators (which includes CTC members) follow the
+[COLLABORATOR_GUIDE.md](./COLLABORATOR_GUIDE.md) in maintaining the Node.js
+project.
 
 ### Release Team