Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Code Review

This pull request enables documentation generation for the sqlalchemy-spanner package by adding a comprehensive README.rst, Sphinx configuration (conf.py), custom CSS, and HTML templates. It also updates the noxfile.py to install necessary dependencies and execute the sphinx-build process. The review feedback identifies a broken link to the samples directory, several typos in the documentation text, and a copy-paste error in the configuration file header.