Update E0207 label to report parameter type

Fixes #35642.

Author: terrynsun

src/librustc_typeck/collect.rs

@@ -2323,7 +2323,6 @@ fn report_unused_parameter(ccx: &CrateCtxt,
         "the {} parameter `{}` is not constrained by the \
         impl trait, self type, or predicates",
         kind, name)
-        .span_label(span, &format!("unconstrained lifetime parameter"))
+        .span_label(span, &format!("unconstrained {} parameter", kind))
         .emit();
-
 }

src/test/compile-fail/E0207.rs

@@ -11,7 +11,7 @@
 struct Foo;
 
 impl<T: Default> Foo { //~ ERROR E0207
-                       //~| NOTE unconstrained lifetime parameter
+                       //~| NOTE unconstrained type parameter
     fn get(&self) -> T {
         <T as Default>::default()
     }