Fix the documentation for ElementVisitor (issue 37151)

Change-Id: I03fbcb022bc92aaa88f65aeb895cad5de0b38e6e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/105100
Auto-Submit: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>

pkg/analyzer/lib/dart/element/element.dart

@@ -941,7 +941,7 @@ abstract class ElementLocation {
 ///
 /// Clients may not extend, implement or mix-in this class. There are classes
 /// that implement this interface that provide useful default behaviors in
-/// `package:analyzer/dart/ast/visitor.dart`. A couple of the most useful
+/// `package:analyzer/dart/element/visitor.dart`. A couple of the most useful
 /// include
 /// * SimpleElementVisitor which implements every visit method by doing nothing,
 /// * RecursiveElementVisitor which will cause every node in a structure to be