Fix documentation of MemberExpr::getMemberDecl

cfe/trunk/include/clang/AST/Expr.h

static MemberExpr *Create(const ASTContext &C, Expr *base, bool isarrow,
                             const TemplateArgumentListInfo *targs, QualType ty,
                             ExprValueKind VK, ExprObjectKind OK);
 
   void setBase(Expr *E) { Base = E; }
   Expr *getBase() const { return cast<Expr>(Base); }
 
   /// \brief Retrieve the member declaration to which this expression refers.
   ///
-  /// The returned declaration will either be a FieldDecl or (in C++)
-  /// a CXXMethodDecl.
+  /// The returned declaration will be a FieldDecl or (in C++) a VarDecl (for
+  /// static data members), a CXXMethodDecl, or an EnumConstantDecl.
   ValueDecl *getMemberDecl() const { return MemberDecl; }
   void setMemberDecl(ValueDecl *D) { MemberDecl = D; }
 
   /// \brief Retrieves the declaration found by lookup.
   DeclAccessPair getFoundDecl() const {
     if (!HasQualifierOrFoundDecl)
       return DeclAccessPair::make(getMemberDecl(),
                                   getMemberDecl()->getAccess());