Update uitests

Author: JonathanBrouwer

tests/ui/attributes/rustc_confusables.rs

@@ -45,4 +45,5 @@ impl Bar {
 #[rustc_confusables("blah")]
 //~^ ERROR attribute cannot be used on
 //~| HELP can only be applied to
+//~| HELP remove the attribute
 fn not_inherent_impl_method() {}

tests/ui/extern/issue-47725.rs

@@ -4,12 +4,14 @@
 //~^ WARN attribute cannot be used on
 //~| WARN previously accepted
 //~| HELP can be applied to
+//~| HELP remove the attribute
 struct Foo;
 
 #[link_name = "foobar"]
 //~^ WARN attribute cannot be used on
 //~| WARN previously accepted
 //~| HELP can be applied to
+//~| HELP remove the attribute
 extern "C" {
     fn foo() -> u32;
 }
@@ -19,6 +21,7 @@ extern "C" {
 //~| HELP must be of the form
 //~| WARN attribute cannot be used on
 //~| WARN previously accepted
+//~| HELP remove the attribute
 //~| HELP can be applied to
 //~| NOTE for more information, visit
 extern "C" {

tests/ui/extern/issue-47725.stderr

@@ -1,5 +1,5 @@
 error[E0539]: malformed `link_name` attribute input
-  --> $DIR/issue-47725.rs:17:1
+  --> $DIR/issue-47725.rs:19:1
    |
 LL | #[link_name]
    | ^^^^^^^^^^^^ help: must be of the form: `#[link_name = "name"]`
@@ -21,7 +21,7 @@ LL | #![warn(unused_attributes)]
    |         ^^^^^^^^^^^^^^^^^
 
 warning: `#[link_name]` attribute cannot be used on foreign modules
-  --> $DIR/issue-47725.rs:9:1
+  --> $DIR/issue-47725.rs:10:1
    |
 LL | #[link_name = "foobar"]
    | ^^^^^^^^^^^^^^^^^^^^^^^
@@ -30,7 +30,7 @@ LL | #[link_name = "foobar"]
    = help: `#[link_name]` can be applied to foreign functions, foreign statics
 
 warning: `#[link_name]` attribute cannot be used on foreign modules
-  --> $DIR/issue-47725.rs:17:1
+  --> $DIR/issue-47725.rs:19:1
    |
 LL | #[link_name]
    | ^^^^^^^^^^^^