On single local candidate, use span label

src/test/ui/issues/issue-5153.stderr

@@ -1,12 +1,13 @@
 error[E0599]: no method named `foo` found for reference `&dyn Foo` in the current scope
   --> $DIR/issue-5153.rs:10:27
    |
+LL | trait Foo {
+   | --------- this trait defines an item `foo`
+...
 LL |     (&5isize as &dyn Foo).foo();
    |                           ^^^ method not found in `&dyn Foo`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
-   = note: the following trait defines an item `foo`, perhaps you need to implement it:
-           candidate #1: `Foo`
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-57362-1.stderr

@@ -1,13 +1,14 @@
 error[E0599]: no method named `f` found for fn pointer `fn(&u8)` in the current scope
   --> $DIR/issue-57362-1.rs:20:7
    |
+LL | trait Trait {
+   | ----------- this trait defines an item `f`
+...
 LL |     a.f();
    |       ^ method not found in `fn(&u8)`
    |
    = note: `a` is a function, perhaps you wish to call it
    = help: items from traits can only be used if the trait is implemented and in scope
-   = note: the following trait defines an item `f`, perhaps you need to implement it:
-           candidate #1: `Trait`
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-57362-2.stderr

@@ -1,12 +1,13 @@
 error[E0599]: no function or associated item named `make_g` found for fn pointer `for<'r> fn(&'r ())` in the current scope
   --> $DIR/issue-57362-2.rs:22:25
    |
+LL | trait X {
+   | ------- this trait defines an item `make_g`
+...
 LL |     let x = <fn (&())>::make_g();
    |                         ^^^^^^ function or associated item not found in `for<'r> fn(&'r ())`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
-   = note: the following trait defines an item `make_g`, perhaps you need to implement it:
-           candidate #1: `X`
 
 error: aborting due to previous error