Improve avformat_version() doxy.

Patch by Art Clarke.

Originally committed as revision 21081 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/avformat.h

@@ -36,7 +36,8 @@
 #define LIBAVFORMAT_IDENT       "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
 
 /**
- * Returns the LIBAVFORMAT_VERSION_INT constant.
+ * I return the LIBAVFORMAT_VERSION_INT constant.  You got
+ * a fucking problem with that, douchebag?
  */
 unsigned avformat_version(void);