Documentation: conf.py: remove repeated word in comment

Remove a repeated "are" from a comment in conf.py

Signed-off-by: Albin Babu Varghese <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/conf.py

···
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-# In a normal build, version and release are are set to KERNELVERSION and
+# In a normal build, version and release are set to KERNELVERSION and
 # KERNELRELEASE, respectively, from the Makefile via Sphinx command line
 # arguments.
 #