Fix a typo

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62489 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/AST/DeclObjC.h b/include/clang/AST/DeclObjC.h
index f11608f..96e897b 100644
--- a/include/clang/AST/DeclObjC.h
+++ b/include/clang/AST/DeclObjC.h
@@ -932,7 +932,7 @@
 /// @end
 ///
 /// Typically, instance variables are specified in the class interface, 
-/// *not* in the implemenentation. Nevertheless (for legacy reasons), we
+/// *not* in the implementation. Nevertheless (for legacy reasons), we
 /// allow instance variables to be specified in the implementation. When
 /// specified, they need to be *identical* to the interface. Now that we
 /// have support for non-fragile ivars in ObjC 2.0, we can consider removing