Fix file name in comment.

Patch by Yang Chen.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155658 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Tooling/RecursiveASTVisitorTest.cpp b/unittests/Tooling/RecursiveASTVisitorTest.cpp
index 247a5fe..d4fda73 100644
--- a/unittests/Tooling/RecursiveASTVisitorTest.cpp
+++ b/unittests/Tooling/RecursiveASTVisitorTest.cpp
@@ -1,4 +1,4 @@
-//===- unittest/AST/RecursiveASTMatcherTest.cpp ---------------------------===//
+//===- unittest/Tooling/RecursiveASTVisitorTest.cpp -----------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //