Documentation | eng: add formatting guidance (!217)

[Gedare Bloom (@gedare)]

Gedare Bloom created a merge request: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/217

Project:Branches: gedare/rtems-docs:RTEMS-format to rtems/docs/rtems-docs:main
Author:   Gedare Bloom
Assignee: Gedare Bloom


## Summary

Adds sections to explain formatting guidance for C/C++, markdown, and Python.

Still need additional instruction on usage.

Updates #132.

Updates #133 

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