doc-rst: pixfmt-yuv411p: remove an empty column

The conversion added an empty column (probably, it was used on
DocBook just to increase spacing.

It also added an extra line on one of the texts, breaking
the original paragraph into two ones.

Remove them.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/linux_tv/media/v4l/pixfmt-yuv411p.rst

@@ -30,11 +30,9 @@ have ¼ as many pad bytes after their rows. In other words, four C x rows
 (including padding) is exactly as long as one Y row (including padding).
 
 **Byte Order..**
-
 Each cell is one byte.
 
 
-
 .. flat-table::
     :header-rows:  0
     :stub-columns: 0
@@ -152,13 +150,11 @@ Each cell is one byte.
        -  
        -  0
 
-       -  
        -  1
 
        -  
        -  2
 
-       -  
        -  3
 
     -  .. row 2
@@ -167,14 +163,12 @@ Each cell is one byte.
 
        -  Y
 
-       -  
        -  Y
 
        -  C
 
        -  Y
 
-       -  
        -  Y
 
     -  .. row 3
@@ -183,14 +177,12 @@ Each cell is one byte.
 
        -  Y
 
-       -  
        -  Y
 
        -  C
 
        -  Y
 
-       -  
        -  Y
 
     -  .. row 4
@@ -199,14 +191,12 @@ Each cell is one byte.
 
        -  Y
 
-       -  
        -  Y
 
        -  C
 
        -  Y
 
-       -  
        -  Y
 
     -  .. row 5
@@ -215,12 +205,10 @@ Each cell is one byte.
 
        -  Y
 
-       -  
        -  Y
 
        -  C
 
        -  Y
 
-       -  
        -  Y