doc: simplify first-time contributors section of Collaborator Guide

PR-URL: #24387
Reviewed-By: Ouyang Yadong <oyydoibh@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>

Author: Trott

COLLABORATOR_GUIDE.md

@@ -50,16 +50,14 @@ request. See [Who to CC in the issue tracker](#who-to-cc-in-the-issue-tracker).
 
 ### Welcoming First-Time Contributors
 
-Courtesy should always be shown to individuals submitting issues and pull
-requests to the Node.js project. Be welcoming to first-time contributors,
-identified by the GitHub ![First-time contributor](./doc/first_timer_badge.png)
-badge.
+Always show courtesy to individuals submitting issues and pull requests. Be
+welcoming to first-time contributors, identified by the GitHub
+![First-time contributor](./doc/first_timer_badge.png) badge.
 
-For first-time contributors, check if the commit author is the same as the
-pull request author, and ask if they have configured their git
+For first-time contributors, check if the commit author is the same as the pull
+request author. This way, once their pull request lands, GitHub will show them
+as a _Contributor_. Ask if they have configured their git
 [username][git-username] and [email][git-email] to their liking.
-This is to make sure they would be promoted to "contributor" once their
-pull request lands.
 
 ### Closing Issues and Pull Requests