Improve understanding ofavcodec_find_decoder()

patch by Carl Eugen Hoyos: ! cehoyos ag or at !

Originally committed as revision 9301 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/apiexample.c

@@ -433,8 +433,7 @@ int main(int argc, char **argv)
     /* must be called before using avcodec lib */
     avcodec_init();
 
-    /* register all the codecs (you can also register only the codec
-       you wish to have smaller code */
+    /* register all the codecs */
     avcodec_register_all();
 
     if (argc <= 1) {

libavcodec/avcodec.h

@@ -2517,6 +2517,7 @@ int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, v
  * @warning This function is not thread safe!
  *
  * @code
+ * avcodec_register_all();
  * codec = avcodec_find_decoder(CODEC_ID_H264);
  * if (!codec)
  *     exit(1);