Rename the 'Attributes' class to 'Attribute'. It's going to represent a single attribute in the future.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170500 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 177b3a6..817de20 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -752,7 +752,7 @@
     if (FTL && VisitFunctionTypeLoc(*FTL, true))
       return true;
     
-    // FIXME: Attributes?
+    // FIXME: Attribute?
   }
   
   if (ND->doesThisDeclarationHaveABody() && !ND->isLateTemplateParsed()) {