media: vidioc-g-tuner.rst: Fix table number of cols

The Tuner Audio Matrix table is broken: the first row has 7
columns instead of 6, causing it to be parsed wrong and displayed
very badly on PDF output.

Fix it and adjust the table to look nice at PDF output
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/v4l/vidioc-g-tuner.rst

@@ -395,14 +395,17 @@ To change the radio frequency the
 
     \scriptsize
 
+.. tabularcolumns:: |p{1.5cm}|p{1.5cm}|p{2.9cm}|p{2.9cm}|p{2.9cm}|p{2.9cm}|
+
 .. _tuner-matrix:
 
 .. flat-table:: Tuner Audio Matrix
     :header-rows:  2
     :stub-columns: 0
+    :widths: 7 7 14 14 14 14
 
     * -
-      - :cspan:`5` Selected ``V4L2_TUNER_MODE_``
+      - :cspan:`4` Selected ``V4L2_TUNER_MODE_``
     * - Received ``V4L2_TUNER_SUB_``
       - ``MONO``
       - ``STEREO``
@@ -435,7 +438,7 @@ To change the radio frequency the
       - L+R/SAP (preferred) or L/R or L+R/L+R
     * - ``LANG1 | LANG2``
       - Language 1
-      - Lang1/Lang2 (deprecated [#f2]_) or Lang1/Lang1
+      - Lang1/Lang2 (deprecated\ [#f2]_) or Lang1/Lang1
       - Language 1
       - Language 2
       - Lang1/Lang2 (preferred) or Lang1/Lang1