reduce redundant are's
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@94009 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Rewrite/DeltaTree.cpp b/lib/Rewrite/DeltaTree.cpp
index 101cf93..35e888b 100644
--- a/lib/Rewrite/DeltaTree.cpp
+++ b/lib/Rewrite/DeltaTree.cpp
@@ -20,7 +20,7 @@
using llvm::dyn_cast;
/// The DeltaTree class is a multiway search tree (BTree) structure with some
-/// fancy features. B-Trees are are generally more memory and cache efficient
+/// fancy features. B-Trees are generally more memory and cache efficient
/// than binary trees, because they store multiple keys/values in each node.
///
/// DeltaTree implements a key/value mapping from FileIndex to Delta, allowing