Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/ADT/edit_distance.h b/linux-x64/clang/include/llvm/ADT/edit_distance.h
index 06a01b1..b2e8ec5 100644
--- a/linux-x64/clang/include/llvm/ADT/edit_distance.h
+++ b/linux-x64/clang/include/llvm/ADT/edit_distance.h
@@ -22,7 +22,7 @@
 
 namespace llvm {
 
-/// \brief Determine the edit distance between two sequences.
+/// Determine the edit distance between two sequences.
 ///
 /// \param FromArray the first sequence to compare.
 ///