Bug #31900 Wrong confusing comment in mysql_com.h header file.

comment fixed as we truly need const_item to be 1 to mark
constant function

include/mysql_com.h

@@ -329,7 +329,7 @@ typedef struct st_udf_init
   unsigned int decimals;       /* for real functions */
   unsigned long max_length;    /* For string functions */
   char *ptr;                   /* free pointer for function data */
-  my_bool const_item;			/* 0 if result is independent of arguments */
+  my_bool const_item;          /* 1 if function always returns the same value */
 } UDF_INIT;
 
   /* Constants when using compression */