Update src/librustc_error_codes/error_codes/E0634.md

Co-Authored-By: Dylan DPC <dylan.dpc@gmail.com>

Author: ayushmishra2005

src/librustc_error_codes/error_codes/E0634.md

@@ -11,7 +11,7 @@ struct Company(i32);
 struct Company(i32);
 ```
 
-You cannot use conflicting `packed` hint on a same type. If you want to pack a
+You cannot use conflicting `packed` hints on a same type. If you want to pack a
 type to a given size, you should provide a size to packed:
 
 ```