Remove duplicate "and" in 'Linux NVMe docs.

Remove duplicate occurrence of 'and' in
'Linux NVMe Feature and Quirk Policy' title heading.

tested: Not breaking anything.

Signed-off-by: Shivam Chaudhary <cvam0000@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20240910052737.30579-1-cvam0000@gmail.com>