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>

Documentation/nvme/feature-and-quirk-policy.rst

 .. SPDX-License-Identifier: GPL-2.0
 
-=======================================
-Linux NVMe feature and and quirk policy
-=======================================
+===================================
+Linux NVMe feature and quirk policy
+===================================
 
 This file explains the policy used to decide what is supported by the
 Linux NVMe driver and what is not.