fix a few spelling errors and typos

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67758 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/ClangDiagnosticsEmitter.cpp b/utils/TableGen/ClangDiagnosticsEmitter.cpp
index 38bbf8e..3d35351 100644
--- a/utils/TableGen/ClangDiagnosticsEmitter.cpp
+++ b/utils/TableGen/ClangDiagnosticsEmitter.cpp
@@ -24,7 +24,7 @@
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//
-// Generic routines for all Clang TableGen backens.
+// Generic routines for all Clang TableGen backends.
 //===----------------------------------------------------------------------===//
 
 typedef std::vector<Record*> RecordVector;