media: Adjust column width for pdfdocs

The column width specifiers added in commit 8d0e3fc6 ("media:
Add 2-10-10-10 RGB formats") don't suffice for column 1 and too
wide for column 2.

Adjust them to get a good looking table.

Fixes: 8d0e3fc6 ("media: Add 2-10-10-10 RGB formats")
Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Link: https://lore.kernel.org/r/f94e3ada-212c-eef7-9e7b-03760bb29521@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/userspace-api/media/v4l/pixfmt-rgb.rst

@@ -778,7 +778,7 @@ number of bits for each component.
     \tiny
     \setlength{\tabcolsep}{2pt}
 
-.. tabularcolumns:: |p{2.8cm}|p{2.0cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|
+.. tabularcolumns:: |p{3.2cm}|p{0.8cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|
 
 
 .. flat-table:: RGB Formats 10 Bits Per Color Component