Update E0185 and E0186 to new format

src/test/compile-fail/E0185.rs

@@ -9,13 +9,14 @@
 // except according to those terms.
 
 trait Foo {
-    fn foo();
+    fn foo(); //~ trait declared without `&self`
 }
 
 struct Bar;
 
 impl Foo for Bar {
     fn foo(&self) {} //~ ERROR E0185
+    //~^ `&self` used in impl
 }
 
 fn main() {

src/test/compile-fail/E0186.rs

@@ -9,13 +9,14 @@
 // except according to those terms.
 
 trait Foo {
-    fn foo(&self);
+    fn foo(&self); //~ `&self` used in trait
 }
 
 struct Bar;
 
 impl Foo for Bar {
     fn foo() {} //~ ERROR E0186
+    //~^ expected `&self` in impl
 }
 
 fn main() {