Fix pasto, add a comment.

llvm-svn: 102263
diff --git a/clang/lib/CodeGen/CGDebugInfo.h b/clang/lib/CodeGen/CGDebugInfo.h
index ed5c76b..c16379a 100644
--- a/clang/lib/CodeGen/CGDebugInfo.h
+++ b/clang/lib/CodeGen/CGDebugInfo.h
@@ -196,6 +196,7 @@
   /// CreateTypeNode - Create type metadata for a source language type.
   llvm::DIType CreateTypeNode(QualType Ty, llvm::DIFile F);
 
+  /// CreateMemberType - Create new member and increase Offset by FType's size.
   llvm::DIType CreateMemberType(llvm::DIFile Unit, QualType FType,
                                 llvm::StringRef Name, uint64_t *Offset);