libvlc.h: improve docstrings

include/vlc/libvlc.h

@@ -101,6 +101,8 @@ LIBVLC_API void libvlc_clearerr (void);
 /**
  * Sets the LibVLC error status and message for the current thread.
  * Any previous error is overridden.
+ * \param fmt the format string
+ * \param ap the arguments
  * \return a nul terminated string in any case
  */
 LIBVLC_API const char *libvlc_vprinterr (const char *fmt, va_list ap);
@@ -108,6 +110,8 @@ LIBVLC_API const char *libvlc_vprinterr (const char *fmt, va_list ap);
 /**
  * Sets the LibVLC error status and message for the current thread.
  * Any previous error is overridden.
+ * \param fmt the format string
+ * \param args the arguments
  * \return a nul terminated string in any case
  */
 LIBVLC_API const char *libvlc_printerr (const char *fmt, ...);