Remove outdated comment

Author: estebank

Diff for: tests/ui/expr/if/bad-if-let-suggestion.rs

@@ -1,7 +1,3 @@
-// FIXME(compiler-errors): This really should suggest `let` on the RHS of the
-// `&&` operator, but that's kinda hard to do because of precedence.
-// Instead, for now we just make sure not to suggest `if let let`.
-
 fn b() {
     if (i + j) = i {}
     //~^ ERROR cannot find value `i` in this scope

Diff for: tests/ui/expr/if/bad-if-let-suggestion.stderr

@@ -1,23 +1,23 @@
 error[E0425]: cannot find value `i` in this scope
-  --> $DIR/bad-if-let-suggestion.rs:6:9
+  --> $DIR/bad-if-let-suggestion.rs:2:9
    |
 LL |     if (i + j) = i {}
    |         ^ not found in this scope
 
 error[E0425]: cannot find value `j` in this scope
-  --> $DIR/bad-if-let-suggestion.rs:6:13
+  --> $DIR/bad-if-let-suggestion.rs:2:13
    |
 LL |     if (i + j) = i {}
    |             ^ not found in this scope
 
 error[E0425]: cannot find value `i` in this scope
-  --> $DIR/bad-if-let-suggestion.rs:6:18
+  --> $DIR/bad-if-let-suggestion.rs:2:18
    |
 LL |     if (i + j) = i {}
    |                  ^ not found in this scope
 
 error[E0425]: cannot find value `x` in this scope
-  --> $DIR/bad-if-let-suggestion.rs:13:8
+  --> $DIR/bad-if-let-suggestion.rs:9:8
    |
 LL | fn b() {
    | ------ similarly named function `b` defined here