Typo fixes

doc/install.txt

@@ -536,7 +536,7 @@ Then you must install g++. You can do this by installing XCode. See the first bu
    If you use the trunk or version 0.6 or later of Theano, we try to
    automaticaly link with the EPD blas version.  Due to Mac OS
    peculiarities, we need a user intervention to do it.  We detect
-   if the user did the modification and if not, we tell him how todo
+   if the user did the modification and if not, we tell him how to do
    it.
 
 .. _macports:

theano/gof/vm.py

@@ -493,10 +493,10 @@ try:
 except ImportError:
     pass
 except OSError:
-    #OSError happen when g++ is not installed.  In that case, we
-    #alread changed the default linker to something else then CVM.
-    #Currently this is the py linker.
-    #Here we assert that the default linker is not cvm.
+    # OSError happens when g++ is not installed.  In that case, we
+    # already changed the default linker to something else then CVM.
+    # Currently this is the py linker.
+    # Here we assert that the default linker is not cvm.
     assert not [x for x in theano.configparser._config_var_list
                 if x.fullname == 'linker'][0].default.startswith('cvm')
     pass