clarify/fix up comment in test

Author: y21

tests/ui/useless_conversion.fixed

@@ -228,8 +228,8 @@ mod issue11300 {
         // and `[i32; 3]: Helper<()>` is not true (only `std::array::IntoIter<i32, 3>: Helper<()>` is).
         foo2::<(), _>([1, 2, 3].into_iter());
 
-        // This should lint. `I` gets substituted with `[i32; 3]`, and
-        // `i32: Helper<[i32, 3]>` is true.
+        // This should lint. Removing the `.into_iter()` means that `I` gets substituted with `[i32; 3]`, and
+        // `i32: Helper2<[i32, 3]>` is true, so this call is indeed unncessary.
         foo3([1, 2, 3]);
     }
 }

tests/ui/useless_conversion.rs

@@ -228,8 +228,8 @@ mod issue11300 {
         // and `[i32; 3]: Helper<()>` is not true (only `std::array::IntoIter<i32, 3>: Helper<()>` is).
         foo2::<(), _>([1, 2, 3].into_iter());
 
-        // This should lint. `I` gets substituted with `[i32; 3]`, and
-        // `i32: Helper<[i32, 3]>` is true.
+        // This should lint. Removing the `.into_iter()` means that `I` gets substituted with `[i32; 3]`, and
+        // `i32: Helper2<[i32, 3]>` is true, so this call is indeed unncessary.
         foo3([1, 2, 3].into_iter());
     }
 }