Merge pull request #2638 from nouiz/doc_dnn

doc/library/sandbox/cuda/dnn.txt

@@ -34,6 +34,15 @@ Theano will still work if the user did not introduce them manually.
 To get an error if Theano can not use cuDNN, use this Theano flag:
 ``optimizer_including=cudnn``.
 
+.. note::
+
+   CuDNN v2 is now released, if you used any v2 release candidate, we
+   strongly suggest that you update it to the final version. From now
+   on, we only support the final release.
+
+   CuDNN v2 is much faster then v1. We recommand to every body to
+   update from v2.
+
 .. note::
 
     Normally you should not call GPU Ops directly, but the CPU interface
@@ -49,6 +58,12 @@ To get an error if Theano can not use cuDNN, use this Theano flag:
     input of the convolution. They are also used sometimes in the forward 
     pass, when they give a speed up.
 
+.. note::
+
+    There is a problem we do not understand yet when cudnn path are
+    used with symbolic link. So avoid using that.
+
+
 Functions
 =========
 

doc/tutorial/loop.txt

@@ -244,7 +244,7 @@ Note that we need to iterate over the indices of ``y`` and not over the elements
   accumulator(5)
   k.get_value()
 
-**Scan Example: Computing tanh(v.dot(W) + b) * d where b is binomial**
+**Scan Example: Computing tanh(v.dot(W) + b) * d where d is binomial**
 
 .. code-block:: python