minor modifications to install docs, mainly to use python 2.6 on OS X

doc/install.txt

@@ -330,7 +330,7 @@ Mac
 
     .. code-block:: bash
 
-        $ sudo port install gcc44 py25-scipy mercurial python_select
+        $ sudo port install gcc44 py26-scipy mercurial python_select
 
     This will install all the required Theano dependencies.  Note that
     compiling gcc takes significant time (hours)! SciPy depends on ATLAS (a
@@ -344,13 +344,13 @@ Mac
   packages are updated quite frequently.
 
 - In order to use the MacPorts version of python, you might
-  need to explicitly select it with ``sudo python_select python25``. The
+  need to explicitly select it with ``sudo python_select python26``. The
   reason this is necessary is because you might have an Apple-provided python
   (via, for example, an Xcode installation). After performing this step, you
   should check that the symbolic link provided by ``which python`` points to
   the MacPorts python. For instance, on Snow Leopard with the latest MacPorts, 
   the output of ``which python`` is ``/opt/local/bin/python`` and this symbolic
-  link points to ``/opt/local/bin/python2.5``. When executing ``sudo
+  link points to ``/opt/local/bin/python2.6``. When executing ``sudo
   python_select python26-apple`` (which you should **not** do), the link
   points to ``/usr/bin/python2.6``.
 
@@ -364,7 +364,7 @@ Mac
 
 - Please follow the same procedure with ``numpy``.
 
-- Put ``export PYTHONPATH=/opt/local/lib/python2.5/site-packages:$PYTHONPATH``
+- Put ``export PYTHONPATH=/opt/local/lib/python2.6/site-packages:$PYTHONPATH``
   in your ``.bashrc`` in order to include your MacPorts Python packages 
   (NumPy, SciPy) in Python's path.
 

doc/tutorial/using_gpu.txt

@@ -21,7 +21,7 @@ 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
 root* directory.
-On Linux or OS-X >= 10.4, you must add the 'lib' subdirectory (and/or 'lib64' subdirectory if you have a 64-bit
+On Linux or OS X >= 10.4, you must add the 'lib' subdirectory (and/or 'lib64' subdirectory if you have a 64-bit Linux
 computer) to your ``$LD_LIBRARY_PATH`` environment variable.