Delete "param MD The MacroDefinition if the name was a macro, null
otherwise.". 

Reason: MD, a reference, can't be null. 

 
Index: include/clang/Lex/PPCallbacks.h
===================================================================
--- include/clang/Lex/PPCallbacks.h	(revision 274481)
+++ include/clang/Lex/PPCallbacks.h	(working copy)
@@ -256,7 +256,6 @@
   }
   
   /// \brief Hook called whenever the 'defined' operator is seen.
-  /// \param MD The MacroDirective if the name was a macro, null otherwise.
   virtual void Defined(const Token &MacroNameTok, const MacroDefinition &MD,
                        SourceRange Range) {
   }
@@ -294,7 +293,6 @@
   /// \brief Hook called whenever an \#ifdef is seen.
   /// \param Loc the source location of the directive.
   /// \param MacroNameTok Information on the token being tested.
-  /// \param MD The MacroDefinition if the name was a macro, null otherwise.
   virtual void Ifdef(SourceLocation Loc, const Token &MacroNameTok,
                      const MacroDefinition &MD) {
   }
@@ -302,7 +300,6 @@
   /// \brief Hook called whenever an \#ifndef is seen.
   /// \param Loc the source location of the directive.
   /// \param MacroNameTok Information on the token being tested.
-  /// \param MD The MacroDefiniton if the name was a macro, null otherwise.
   virtual void Ifndef(SourceLocation Loc, const Token &MacroNameTok,
                       const MacroDefinition &MD) {
   }
Index: docs/pp-trace.rst
===================================================================
--- docs/pp-trace.rst	(revision 274481)
+++ docs/pp-trace.rst	(working copy)
@@ -571,7 +571,7 @@
 `MacroExpands <http://clang.llvm.org/doxygen/classclang_1_1PPCallbacks.html#a9bc725209d3a071ea649144ab996d515>`_ Callback
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-MacroExpands is called when ::HandleMacroExpandedIdentifier when a macro invocation is found.
+MacroExpands is called when a macro invocation is found.
 
 Argument descriptions:
 
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