avformat/av1: fix AV1CodecConfigurationBox name in doxy

Signed-off-by: James Almer <jamrial@gmail.com>

libavformat/av1.h

@@ -59,7 +59,7 @@ int ff_av1_filter_obus_buf(const uint8_t *buf, uint8_t **out, int *size);
  * Writes AV1 extradata (Sequence Header and Metadata OBUs) to the provided
  * AVIOContext.
  *
- * @param pb pointer to the AVIOContext where the hvcC shall be written
+ * @param pb pointer to the AVIOContext where the av1C box shall be written
  * @param buf input data buffer
  * @param size size in bytes of the input data buffer
  *