Update NLL tests

Author: estebank

src/test/ui/kindck/kindck-impl-type-params.nll.stderr

@@ -1,42 +1,50 @@
 error[E0277]: `T` cannot be sent between threads safely
   --> $DIR/kindck-impl-type-params.rs:18:13
    |
+LL | fn f<T>(val: T) {
+   |      - help: consider restricting this bound: `T: std::marker::Send`
+LL |     let t: S<T> = S(marker::PhantomData);
 LL |     let a = &t as &dyn Gettable<T>;
    |             ^^ `T` cannot be sent between threads safely
    |
    = help: the trait `std::marker::Send` is not implemented for `T`
-   = help: consider adding a `where T: std::marker::Send` bound
    = note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
    = note: required for the cast to the object type `dyn Gettable<T>`
 
 error[E0277]: the trait bound `T: std::marker::Copy` is not satisfied
   --> $DIR/kindck-impl-type-params.rs:18:13
    |
+LL | fn f<T>(val: T) {
+   |      - help: consider restricting this bound: `T: std::marker::Copy`
+LL |     let t: S<T> = S(marker::PhantomData);
 LL |     let a = &t as &dyn Gettable<T>;
    |             ^^ the trait `std::marker::Copy` is not implemented for `T`
    |
-   = help: consider adding a `where T: std::marker::Copy` bound
    = note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
    = note: required for the cast to the object type `dyn Gettable<T>`
 
 error[E0277]: `T` cannot be sent between threads safely
   --> $DIR/kindck-impl-type-params.rs:25:31
    |
+LL | fn g<T>(val: T) {
+   |      - help: consider restricting this bound: `T: std::marker::Send`
+LL |     let t: S<T> = S(marker::PhantomData);
 LL |     let a: &dyn Gettable<T> = &t;
    |                               ^^ `T` cannot be sent between threads safely
    |
    = help: the trait `std::marker::Send` is not implemented for `T`
-   = help: consider adding a `where T: std::marker::Send` bound
    = note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
    = note: required for the cast to the object type `dyn Gettable<T>`
 
 error[E0277]: the trait bound `T: std::marker::Copy` is not satisfied
   --> $DIR/kindck-impl-type-params.rs:25:31
    |
+LL | fn g<T>(val: T) {
+   |      - help: consider restricting this bound: `T: std::marker::Copy`
+LL |     let t: S<T> = S(marker::PhantomData);
 LL |     let a: &dyn Gettable<T> = &t;
    |                               ^^ the trait `std::marker::Copy` is not implemented for `T`
    |
-   = help: consider adding a `where T: std::marker::Copy` bound
    = note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
    = note: required for the cast to the object type `dyn Gettable<T>`