added more descriptive comment

Author: Sriya Pratipati

libc/src/wchar/wchar_utils.h

@@ -26,14 +26,14 @@ LIBC_INLINE bool internal_wcschr(wchar_t c, const wchar_t *str) {
   return false;
 }
 
-// To avoid duplicated code, call this with true for wcscspn and call with false
-// for wcsspn
+// bool should be true for wcscspn for complimentary span
+// should be false for wcsspn since we want it to span
 LIBC_INLINE size_t inline_wcsspn(const wchar_t *s1, const wchar_t *s2,
-                                 bool match_set) {
+                                 bool not_match_set) {
   size_t i = 0;
   for (; s1[i]; ++i) {
     bool in_set = internal_wcschr(s1[i], s2);
-    if (in_set == match_set)
+    if (in_set == not_match_set)
       return i;
   }
   return i;