Update docs for setting verbose/quiet in config file or env var
Update docs for setting verbose/quiet in config file or env var

Co-authored-by: Paul Moore <166cd9666f57883e93bcaf18256d094d703cedb3@gmail.com>
Co-authored-by: Prashant Sharma <7a39c598d68756438b221afd693010ad559c0ff0@gmail.com>
Co-authored-by: Xavier Fernandez <26d0e519861c183645e00d0c8ead9f8391d807cd@gmail.com>

pfmoore/pip,pradyunsg/pip,sbidoul/pip,pradyunsg/pip,pfmoore/pip,sbidoul/pip,pypa/pip,pypa/pip