spelling fix

Originally committed as revision 2172 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/apiexample.c

@@ -3,7 +3,7 @@
  * avcodec API use example.
  *
  * Note that this library only handles codecs (mpeg, mpeg4, etc...),
- * not file formats (avi, vob, etc...). See library 'libav' for the
+ * not file formats (avi, vob, etc...). See library 'libavformat' for the
  * format handling 
  */
 

libavcodec/h263dec.c

@@ -165,7 +165,7 @@ static int decode_slice(MpegEncContext *s){
                 return -1; 
         }
         
-        /* restore variables which where modified */
+        /* restore variables which were modified */
         s->first_slice_line=1;
         s->mb_x= s->resync_mb_x;
         s->mb_y= s->resync_mb_y;