Added some missing blank spaces in doc

theano/configdefaults.py

@@ -534,7 +534,7 @@ AddConfigVar('openmp_elemwise_minsize',
 
 AddConfigVar('check_input',
              "Specify if types should check their input in their C code. "
-             "It can be used to speed up compilation, reduce overhead"
-              "(particularly for scalars) and reduce the number of generated C"
+             "It can be used to speed up compilation, reduce overhead "
+              "(particularly for scalars) and reduce the number of generated C "
               "files.",
              BoolParam(True))