doc: remove parenthetical in onboarding-extras

Remove "(I prefer the former)" from onboarding-extras. Without any
explanation as to why one might prefer A over B, it probably raises more
questions than it answers.

PR-URL: #20393
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

doc/onboarding-extras.md

@@ -91,7 +91,7 @@ need to be attached anymore, as only important bugfixes will be included.
 to update from nodejs/node:
 
 * `git checkout master`
-* `git remote update -p` OR `git fetch --all` (I prefer the former)
+* `git remote update -p` OR `git fetch --all`
 * `git merge --ff-only upstream/master` (or `REMOTENAME/BRANCH`)
 
 ## Best practices