[libc][obvious] Fixed wchar.yaml (llvm#142238)

Changed __restricted to __restrict for wmemcpy.

Co-authored-by: Sriya Pratipati <[email protected]>

Author: sribee8

libc/include/wchar.yaml

@@ -69,6 +69,6 @@ functions:
       - stdc
     return_type: wchar_t *
     arguments: 
-      - type: __restricted wchar_t *
-      - type: const __ restricted wchar_t *
+      - type: __restrict wchar_t *
+      - type: const __restrict wchar_t *
       - type: size_t