Fixed spelling.

llvm-svn: 209224
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index ef4f8dd..6993774 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -7013,7 +7013,7 @@
   if (Ctx && !Ctx->isFunctionOrMethod())
     Ctx->addDecl(UDir);
   else
-    // Otherwise, it is at block sope. The using-directives will affect lookup
+    // Otherwise, it is at block scope. The using-directives will affect lookup
     // only to the end of the scope.
     S->PushUsingDirective(UDir);
 }