mark fix as MaybeIncorrect

src/librustc_resolve/lib.rs

@@ -3020,7 +3020,7 @@ fn smart_resolve_path_fragment(&mut self,
                     span,
                     "did you mean",
                     "self".to_string(),
-                    Applicability::MachineApplicable,
+                    Applicability::MaybeIncorrect,
                 );
             }
 

src/test/ui/self/suggest-self.stderr

@@ -5,7 +5,7 @@ LL |         this.x
    |         ^^^^
    |         |
    |         not found in this scope
-   |         help: do you mean: `self`
+   |         help: did you mean: `self`
 
 error[E0425]: cannot find value `this` in this scope
   --> $DIR/suggest-self.rs:36:9
@@ -14,7 +14,7 @@ LL |         this.foo()
    |         ^^^^
    |         |
    |         not found in this scope
-   |         help: do you mean: `self`
+   |         help: did you mean: `self`
 
 error[E0425]: cannot find value `my` in this scope
   --> $DIR/suggest-self.rs:41:9
@@ -23,7 +23,7 @@ LL |         my.bar()
    |         ^^
    |         |
    |         not found in this scope
-   |         help: do you mean: `self`
+   |         help: did you mean: `self`
 
 error: aborting due to 3 previous errors