fix tests

Author: estebank

tests/ui/issues/issue-4736.stderr

@@ -10,7 +10,7 @@ LL |     let z = NonCopyable{ p: () };
 help: `NonCopyable` is a tuple struct, use the appropriate syntax
    |
 LL -     let z = NonCopyable{ p: () };
-LL +     let z = NonCopyable(/* fields */);
+LL +     let z = NonCopyable(/* () */);
    |
 
 error: aborting due to 1 previous error

tests/ui/issues/issue-80607.stderr

@@ -10,7 +10,7 @@ LL |     Enum::V1 { x }
 help: `Enum::V1` is a tuple variant, use the appropriate syntax
    |
 LL -     Enum::V1 { x }
-LL +     Enum::V1(/* fields */)
+LL +     Enum::V1(/* i32 */)
    |
 
 error: aborting due to 1 previous error

tests/ui/numeric/numeric-fields.stderr

@@ -10,7 +10,7 @@ LL |     let s = S{0b1: 10, 0: 11};
 help: `S` is a tuple struct, use the appropriate syntax
    |
 LL -     let s = S{0b1: 10, 0: 11};
-LL +     let s = S(/* fields */);
+LL +     let s = S(/* u8 */, /* u16 */);
    |
 
 error[E0026]: struct `S` does not have a field named `0x1`