Fix few typos in libvlc comments.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

include/vlc/libvlc_media_list.h

@@ -110,7 +110,7 @@ libvlc_media_list_add_media( libvlc_media_list_t *p_ml, libvlc_media_t *p_md );
  * \param p_ml a media list instance
  * \param p_md a media instance
  * \param i_pos position in array where to insert
- * \return 0 on success, -1 if the media list si read-only
+ * \return 0 on success, -1 if the media list is read-only
  */
 LIBVLC_API int
 libvlc_media_list_insert_media( libvlc_media_list_t *p_ml,
@@ -166,7 +166,7 @@ LIBVLC_API int
  * This indicates if this media list is read-only from a user point of view
  *
  * \param p_ml media list instance
- * \return 0 on readonly, 1 on readwrite
+ * \return 1 on readonly, 0 on readwrite
  */
 LIBVLC_API int
     libvlc_media_list_is_readonly( libvlc_media_list_t * p_ml );