Fix a typo in documentation.

Originally committed as revision 20873 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -3336,7 +3336,7 @@ attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *pi
  * In practice, avpkt->data should have 4 byte alignment at minimum.
  *
  * @note Some codecs have a delay between input and output, these need to be
- * feeded with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
+ * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
  *
  * @param avctx the codec context
  * @param[out] picture The AVFrame in which the decoded video frame will be stored.