avcodec/v4l2_m2m: fix cant typo

Reviewed-by: Lou Logan <lou@lrcd.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 062bf56393)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/v4l2_m2m.h

@@ -83,7 +83,7 @@ int ff_v4l2_m2m_codec_init(AVCodecContext *avctx);
 int ff_v4l2_m2m_codec_end(AVCodecContext *avctx);
 
 /**
- * Reinitializes the V4L2m2mContext when the driver cant continue processing
+ * Reinitializes the V4L2m2mContext when the driver cannot continue processing
  * with the capture parameters.
  *
  * @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.
@@ -93,7 +93,7 @@ int ff_v4l2_m2m_codec_end(AVCodecContext *avctx);
 int ff_v4l2_m2m_codec_reinit(V4L2m2mContext *ctx);
 
 /**
- * Reinitializes the V4L2m2mContext when the driver cant continue processing
+ * Reinitializes the V4L2m2mContext when the driver cannot continue processing
  * with the  any of the current V4L2Contexts (ie, changes in output and capture).
  *
  * @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.