Improve psycopg2, psycopg readthedocs on sqlcommenter

[tammy-baylis-swi]

Description

Updates the psycopg2 and psycopg instrumentor readthedocs with sqlcommenter information. Based on the recent changes to the DB-API docs update in #3720, deployed to contrib readthedocs. Also fixes typos, bad original framework docs links in their top-level readmes.

I thought about generating .rst snippets to share between DB-API, psycopg2, psycopg, and other instrumentors to reduce duplication. But I wasn't sure of a good place to put them. Ideas?

Partially fixes #3162

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

1. Virtualenv in Python 3.11
2. tox -e docs
3. Check local build in docs/_build/html/instrumentation/*

Does This PR Require a Core Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated