doc: edit COLLABORATOR_GUIDE.md on closing issues

Make the COLLABORATOR_GUIDE.md text on closing issues clearer. (Make it
clear that all the text refers to issues *and* pull requests, etc.)

PR-URL: #24477
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: Trott

COLLABORATOR_GUIDE.md

@@ -61,13 +61,11 @@ as a _Contributor_. Ask if they have configured their git
 
 ### Closing Issues and Pull Requests
 
-Collaborators may close any issue or pull request they believe is
-not relevant for the future of the Node.js project. Where this is
-unclear, the issue should be left open for several days to allow for
-additional discussion. Where this does not yield input from Node.js
-Collaborators or additional evidence that the issue has relevance, the
-issue may be closed. Remember that issues can always be re-opened if
-necessary.
+Collaborators may close any issue or pull request that is not relevant to the
+future of the Node.js project. Where this is unclear, leave the issue or pull
+request open for several days to allow for discussion. Where this does not yield
+evidence that the issue or pull request has relevance, close it. Remember that
+issues and pull requests can always be re-opened if necessary.
 
 ### Author ready pull requests