Merge pull request #984 from sygi/patch-1

Corrected typo in model doc

blocks/model.py

@@ -7,7 +7,7 @@
 created by Blocks typically has, such as bricks and application calls.  The
 :class:`Model` adds this functionality. Using :class:`Model` you can do
 things like query all the bricks used to build the computation graph,
-request "hierarhical names" of the parameters (a hierarchical name is a
+request "hierarchical names" of the parameters (a hierarchical name is a
 path-like string which in addition to the parameter's name contains names
 of the bricks on the path from a root brick to the brick that owns the
 parameters, e.g. ``/mlp/linear/W``).