doc: remove optional parameter from markdown anchor link

Fix up a few instances so that lines don't xceed 80 characters.

PR-URL: https://github.com/nodejs/node/pull/32671


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>