[NFC] fix trivial typos in comments

"a a"->"a"

llvm-svn: 325753
diff --git a/clang/test/SemaCXX/ms-uuid.cpp b/clang/test/SemaCXX/ms-uuid.cpp
index e29dda8..c26ea68 100644
--- a/clang/test/SemaCXX/ms-uuid.cpp
+++ b/clang/test/SemaCXX/ms-uuid.cpp
@@ -23,7 +23,7 @@
 // clang-cl implements the following simpler (but largely compatible) behavior
 // instead:
 // * [] and __declspec uuids have the same behavior.
-// * If there are several uuids on a a class (no matter if on the same decl or
+// * If there are several uuids on a class (no matter if on the same decl or
 //   on several decls), it is an error if they don't match.
 // * Having several uuids that match is ok.