media: Documentation: userspace-api/media: dvb/demux: drop doubled word

Drop the doubled word "and".

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: [e-mail]
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/userspace-api/media/dvb/demux.rst

···
 implemented at the hardware. Otherwise, the Kernel provides a software
 emulation.
 
-It can be accessed through ``/dev/adapter?/demux?``. Data types and and
+It can be accessed through ``/dev/adapter?/demux?``. Data types and
 ioctl definitions can be accessed by including ``linux/dvb/dmx.h`` in
 your application.