media: docs: Remove extraneous \endgroup from P010 table

The \endgroup command at the bottom of a table added in commit
5374d8fb ("media: Add P010 video format") doesn't have a
corresponding \begingroup command preceding it.

This imbalance causes an build error in "make pdfdocs".

Fix the issue by removing it.

Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Fixes: 5374d8fb ("media: Add P010 video format")
Cc: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Cc: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>