Fixes for doctest failures

Author: kwankyu

src/sage/combinat/crystals/crystals.py

@@ -121,7 +121,7 @@
 For rank two crystals, there is an alternative method of getting
 metapost pictures. For more information see ``C.metapost?``.
 
-.. SEEALSO:: :ref:`The overview of crystal features in Sage<sage.combinat.crystals>`
+.. SEEALSO:: :ref:`The overview of crystal features in Sage<sage.combinat.crystals.all>`
 
 .. TODO::
 

src/sage/combinat/quickref.py

@@ -48,13 +48,13 @@
     sage: L = LatticePolytope(points)
     sage: L.npoints(); L.plot3d()                         # random
 
-:ref:`Root systems, Coxeter and Weyl groups <sage.combinat.root_system>`::
+:ref:`Root systems, Coxeter and Weyl groups <sage.combinat.root_system.all>`::
 
     sage: WeylGroup(["B",3]).bruhat_poset()
     Finite poset containing 48 elements
     sage: RootSystem(["A",2,1]).weight_lattice().plot()   # not tested
 
-:ref:`Crystals <sage.combinat.crystals>`::
+:ref:`Crystals <sage.combinat.crystals.all>`::
 
     sage: CrystalOfTableaux(["A",3], shape = [3,2]).some_flashy_feature() # not tested
 
@@ -71,7 +71,7 @@
     sage: M.an_element() * S.an_element()
     x0
 
-Graph theory, posets, lattices (:ref:`sage.graphs`, :ref:`sage.combinat.posets`)::
+Graph theory, posets, lattices (:ref:`sage.graphs`, :ref:`sage.combinat.posets.all`)::
 
     sage: Poset({1: [2,3], 2: [4], 3: [4]}).linear_extensions().cardinality()
     2

src/sage/combinat/root_system/root_system.py

@@ -2,7 +2,7 @@
 Root systems
 ============
 
-See :ref:`sage.combinat.root_system` for an overview.
+See :ref:`sage.combinat.root_system.all` for an overview.
 """
 #*****************************************************************************
 #       Copyright (C) 2007      Mike Hansen <[email protected]>,