gh-119786: Move parser doc from devguide to InternalDocs (#125119)

gh-119786: Move parser doc from devguide to InternalDocs (#125119)

Co-authored-by: Jacob Coffee <jacob@z7x.org>
Co-authored-by: Carol Willing <carolcode@willingconsulting.com>
Co-Authored-By: Adam Turner <9087854+aa-turner@users.noreply.github.com>
Co-Authored-By: Carl Friedrich Bolz-Tereick <cfbolz@gmx.de>
Co-Authored-By: Carol Willing <carolcode@willingconsulting.com>
Co-Authored-By: Erlend E. Aasland <erlend@python.org>
Co-Authored-By: Ezio Melotti <ezio.melotti@gmail.com>
Co-Authored-By: Hugo van Kemenade <hugovk@users.noreply.github.com>
Co-Authored-By: Irit Katriel <iritkatriel@yahoo.com>
Co-Authored-By: Itamar Ostricher <itamarost@gmail.com>
Co-Authored-By: Julien Palard <julien@palard.fr>
Co-Authored-By: Mana <potpath@users.noreply.github.com>
Co-Authored-By: Muhammad Mahad <mahadpy@gmail.com>
Co-Authored-By: Ned Batchelder <ned@nedbatchelder.com>
Co-Authored-By: Pablo Galindo Salgado <Pablogsal@gmail.com>
Co-Authored-By: slateny <46876382+slateny@users.noreply.github.com>
Co-Authored-By: wookie184 <wookie1840@gmail.com>