Docs: Argument Clinic: Add Background and Tutorial top-level sections (GH-106904)
Add Background as a toplevel section with the following subsections:
- Background
- The goals of Argument Clinic
- Basic concepts and usage
Rename "Converting your first function" to Tutorial.
Add anchors for Background, Tutorial, and How-to Guides:
- :ref:`clinic-background`
- :ref:`clinic-tutorial`
- :ref:`clinic-howtos`
Link to these from within the Abstract.
Break the compatibility paragraph out of Abstract and make it a note.
(cherry picked from commit 81861fd90b)
Co-authored-by: Erlend E. Aasland <erlend@python.org>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
1a3766bb3e
