Change refered to referred

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

src/libvlc-module.c

@@ -202,7 +202,7 @@ static const char *const ppsz_snap_formats[] =
 #define VERBOSE_OBJECTS_LONGTEXT N_( \
     "This is a ',' separated string, each objects should be prefixed by " \
     "a '+' or a '-' to respectively enable or disable it. The keyword " \
-    "'all' refers to all objects. Objects can be refered to by their " \
+    "'all' refers to all objects. Objects can be referred to by their " \
     "type or module name. Rules applying to named objects take precedence " \
     "over rules applying to object types. Note that you still need to " \
     "use -vvv to actually display debug message.")