Replace multitable for the unsharp filter option table with a simple

@table @option.

Allow pod rendering, as texinfo multitables are not supported by
texi2pod.pl, also improve plain texinfo file readability.

Originally committed as revision 23688 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/libavfilter.texi

@@ -254,41 +254,38 @@ faster due to better use of the memory cache.
 
 @section unsharp
 
-Sharpen or blur the input video. It accepts the following parameters:
+Sharpen or blur the input video.
-
+
-@multitable @columnfractions .2 .5 .1 .1 .1
+It accepts the following parameters:
-@headitem Name @tab Description @tab Min @tab Max @tab Default
+@var{luma_msize_x}:@var{luma_msize_y}:@var{luma_amount}:@var{chroma_msize_x}:@var{chroma_msize_y}:@var{chroma_amount}
-@item @var{luma_msize_x}
+
-@tab Luma matrix horizontal size
+@table @option
-@tab 3
+
-@tab 13
+@item luma_msize_x
-@tab 5
+Set the luma matrix horizontal size. It can be an integer between 3
-@item @var{luma_msize_y}
+and 13, default value is 5.
-@tab Luma matrix vertical size
+
-@tab 3
+@item luma_msize_y
-@tab 13
+Set the luma matrix vertical size. It can be an integer between 3
-@tab 5
+and 13, default value is 5.
-@item @var{luma_amount}
+
-@tab Luma effect strength
+@item luma_amount
-@tab -2.0
+Set the luma effect strength. It can be a float number between -2.0
-@tab 5.0
+and 5.0, default value is 1.0.
-@tab 1.0
+
-@item @var{chroma_msize_x}
+@item chroma_msize_x
-@tab Chroma matrix horizontal size
+Set the chroma matrix horizontal size. It can be an integer between 3
-@tab 3
+and 13, default value is 0.
-@tab 13
+
-@tab 0
+@item chroma_msize_y
-@item @var{chroma_msize_y}
+Set the chroma matrix vertical size. It can be an integer between 3
-@tab Chroma matrix vertical size
+and 13, default value is 0.
-@tab 3
+
-@tab 13
+@item chroma_amount
-@tab 0
+Set the chroma effect strength. It can be a float number between -2.0
-@item @var{chroma_amount}
+and 5.0, default value is 0.0.
-@tab Chroma effect strength
+
-@tab -2.0
+@end table
-@tab 5.0
-@tab 0.0
-@end multitable
 
 Negative values for the amount will blur the input video, while positive
 values will sharpen. All parameters are optional and default to the