Change file doxy from

"video format and noformat filters" to
"format and noformat video filters",
as suggested by Diego.

Originally committed as revision 20442 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/vf_format.c

@@ -20,7 +20,7 @@
 
 /**
  * @file libavfilter/vf_format.c
- * video format and noformat filters
+ * format and noformat video filters
  */
 
 #include "avfilter.h"