bpo-45677: Reword first section of `sqlite3` docs (#29326)

* bpo-45677: Avoid addressing the reader as 'you' in sqlite3 docs

* Adjust wording

* Adjust wording again

* Typo

* Update Doc/library/sqlite3.rst

Co-authored-by: Jacob Walls <jacobtylerwalls@gmail.com>

* Address review: adjust wording

* Update Doc/library/sqlite3.rst

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

* Update Lib/sqlite3/__init__.py

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

* Update Doc/library/sqlite3.rst

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

* Update Doc/library/sqlite3.rst

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

* Update Lib/sqlite3/__init__.py

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

* Update Doc/library/sqlite3.rst

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

* Apply Alex' suggestion, and apply 80 char limit to PR

* Minor adjustment

Co-authored-by: Jacob Walls <jacobtylerwalls@gmail.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>