Fix other warnings.

doc/sandbox/sparse.txt

@@ -86,15 +86,15 @@ See the example below for details.
 
 Several things should be learned from the above example:
 
-    * We actually use the wrong sparse matrix type. In fact, it is the
+* We actually use the wrong sparse matrix type. In fact, it is the
   *rows* that are sparse, not the columns. So, it would have been
   better to use ``sp = scipy.sparse.csr_matrix((5, 10))``.
-    * We should have actually created the matrix as a ``lil_matrix``,
+* We should have actually created the matrix as a ``lil_matrix``,
   which is more efficient for inserts. Afterwards, we should convert
   to the appropriate compressed format.
-    * `sp.indptr[0] = 0` and `sp.indptr[1] = 2`, which means that
+* `sp.indptr[0] = 0` and `sp.indptr[1] = 2`, which means that
   column 0 contains sp.data[0:2], i.e. the first two non-zero values.
-    * `sp.indptr[3] = 2` and `sp.indptr[4] = 3`, which means that column
+* `sp.indptr[3] = 2` and `sp.indptr[4] = 3`, which means that column
   3 contains sp.data[2:3], i.e. the third non-zero value.
 
 TODO: Rewrite this documentation to do things in a smarter way.