fixed tests (hope the last time)

Author: TomtheCoder2

tests/rustdoc-ui/not-wf-ambiguous-normalization.stderr

@@ -4,7 +4,7 @@ error[E0207]: the type parameter `T` is not constrained by the impl trait, self
 LL | impl<T> Allocator for DefaultAllocator {
    |      ^ unconstrained type parameter
    |
-help: either remove the type parameter T, or make use of it, for example
+help: either remove the unused type parameter `T`, or make use of it
    |
 LL - impl<T> Allocator for DefaultAllocator {
 LL + impl Allocator for DefaultAllocator {

tests/rustdoc-ui/synthetic-auto-trait-impls/unconstrained-param-in-impl-ambiguity.stderr

@@ -4,7 +4,7 @@ error[E0207]: the type parameter `Q` is not constrained by the impl trait, self
 LL | unsafe impl<Q: Trait> Send for Inner {}
    |             ^ unconstrained type parameter
    |
-help: either remove the type parameter Q, or make use of it, for example
+help: either remove the unused type parameter `Q`, or make use of it
    |
 LL - unsafe impl<Q: Trait> Send for Inner {}
 LL + unsafe impl Send for Inner {}