Fix a few syntax warnings.

doc/library/tensor/basic.txt

@@ -263,7 +263,7 @@ them perfectly, but a dscalar otherwise.
 
 .. note::
 
-    When config.floatX==float32 (see :module:`config`), then Python floats
+    When config.floatX==float32 (see :mod:`config`), then Python floats
     are stored instead as single-precision floats.
 
     For fine control of this rounding policy, see

doc/tutorial/using_gpu.txt

@@ -16,7 +16,7 @@ Setting up CUDA
 
 The first thing you'll need for Theano to use your GPU is Nvidia's
 GPU-programming toolchain.  You should install at least the CUDA driver and the CUDA Toolkit, as 
-:ref:`described here <http://www.nvidia.com/object/cuda_get.html>`.  The CUDA
+`described here <http://www.nvidia.com/object/cuda_get.html>`_.  The CUDA
 Toolkit installs a folder on your computer with subfolders *bin*, *lib*,
 *include*, and some more too.  (Sanity check: The *bin* subfolder should contain an *nvcc*
 program which is the compiler for GPU code.)  This folder is called the *cuda