gh-119786: Move garbage collection doc from devguide to InternalDocs

[iritkatriel]

Co-Authored-By: Adam Turner 9087854+aa-turner@users.noreply.github.com
Co-Authored-By: Carol Willing carolcode@willingconsulting.com
Co-Authored-By: Ezio Melotti ezio.melotti@gmail.com
Co-Authored-By: Hugo van Kemenade hugovk@users.noreply.github.com
Co-Authored-By: Itamar Ostricher itamarost@gmail.com
Co-Authored-By: Jesús Cea jcea@jcea.es
Co-Authored-By: Joannah Nanjekye 33177550+nanjekyejoannah@users.noreply.github.com
Co-Authored-By: Ned Batchelder ned@nedbatchelder.com
Co-Authored-By: Pablo Galindo Salgado Pablogsal@gmail.com
Co-Authored-By: Pamela Fox pamela.fox@gmail.com
Co-Authored-By: Sam Gross colesbury@gmail.com
Co-Authored-By: Stefan Pochmann 609905+pochmann@users.noreply.github.com
Co-Authored-By: T. Wouters thomas@python.org
Co-Authored-By: q-ata 24601033+q-ata@users.noreply.github.com
Co-Authored-By: slateny 46876382+slateny@users.noreply.github.com
Co-Authored-By: Борис Верховский boris.verk@gmail.com

• Issue: create an internals documentation folder in the cpython repo #119786

[JacobCoffee]

Rendered doc: https://github.com/iritkatriel/cpython/blob/gc-doc/InternalDocs/garbage_collector.md
Old guide: https://devguide.python.org/internals/garbage-collector/

[JacobCoffee]

Suggested change

	```
	```pycon

[iritkatriel]

What does this do? I don't notice a difference.

[JacobCoffee]

its supposed to do syntax highlighting, did it not work here? 😬

[JacobCoffee]

TIL pycon

[AA-Turner]

There's also pytb. Though unhelpfully Sphinx uses Pygments and GitHub uses Linguist:

https://github.com/github-linguist/linguist/blob/f164d13fa618023ecf2d8f2ed9a6ce5fae731346/lib/linguist/languages.yml#L5727-L5786

[pablogsal]

Thanks @iritkatriel ❤️

[willingc]

Small nit re: markdown style. It's more common to use single backticks to surround words to render as code. Typically, one would use double backticks only if there was a backtick in the code phrase.