Add error annotations for existing tests

Author: phansch

src/test/ui/resolve/suggest-type.rs

@@ -7,7 +7,11 @@ mod foo {
 fn main() {
     let _ = Cstring::new("hello").unwrap();
     //~^ ERROR failed to resolve: use of undeclared type or module `Cstring`
+    //~| HELP a struct with a similar name exists
+    //~| SUGGESTION CString
 
     let _ = foO::bar();
     //~^ ERROR failed to resolve: use of undeclared type or module `foO`
+    //~| HELP a module with a similar name exists
+    //~| SUGGESTION foo
 }

src/test/ui/resolve/suggest-type.stderr

@@ -8,7 +8,7 @@ LL |     let _ = Cstring::new("hello").unwrap();
    |             help: a struct with a similar name exists (notice the capitalization): `CString`
 
 error[E0433]: failed to resolve: use of undeclared type or module `foO`
-  --> $DIR/suggest-type.rs:11:13
+  --> $DIR/suggest-type.rs:13:13
    |
 LL |     let _ = foO::bar();
    |             ^^^