fix doc generation warning.

doc/library/sparse/index.txt

@@ -161,6 +161,7 @@ List of Implemented Operations
 
 - Monoid (Element-wise operation with only one sparse input).
     `They all have a structured grad.`
+
     - ``structured_sigmoid``
     - ``structured_exp``
     - ``structured_log``
@@ -218,6 +219,7 @@ List of Implemented Operations
 
 - Probability
     `There is no grad implemented for these operations.`
+
     - :class:`Poisson <theano.sparse.basic.Poisson>` and ``poisson``
     - :class:`Binomial <theano.sparse.basic.Binomial>` and ``csc_fbinomial``, ``csc_dbinomial``
       ``csr_fbinomial``, ``csr_dbinomial``
@@ -225,6 +227,7 @@ List of Implemented Operations
 
 - Internal Representation
     `They all have a regular grad implemented.`
+
     - :class:`EnsureSortedIndices <theano.sparse.basic.EnsureSortedIndices>` and ``ensure_sorted_indices``
     - :class:`Remove0 <theano.sparse.basic.Remove0>` and ``remove0``
     - :func:`clean <theano.sparse.basic.clean>` to resort indices and remove zeros

doc/sandbox/index2.txt

@@ -8,7 +8,7 @@ Advanced Topics (under construction)
 .. toctree::
     :maxdepth: 2
 
-    fgraph
+    fg
     compilation
     ccodegen
     function