Refer again to the "width" and "height" crop parameter names

which were previously mentioned, rather than to "w" and "h".

Originally committed as revision 20353 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/libavfilter.texi

@@ -109,7 +109,7 @@ will delimit the rectangle with the top-left corner placed at position
 100:100 and the right-bottom corner corresponding to the right-bottom
 corner of the input image.
 
-The default value of ``w'' and ``h'' is 0.
+The default value of ``width'' and ``height'' is 0.
 
 @section null