small doc/comments fix following code review.

doc/internal/dev_start_guide.txt

@@ -189,7 +189,7 @@ Theano, do it in another branch like described above.
 Optional
 --------
 
-You can instruc git to do color diff. For this, you need to add those line in the file ~/.gitconfig
+You can instruct git to do color diff. For this, you need to add those lines in the file ~/.gitconfig
 
 .. code-block:: bash
 

theano/tensor/basic.py

@@ -4909,7 +4909,8 @@ class AdvancedSubtensor1(Op):
         else:
             o = None
 
-        # I have read that using clip or wrap mode make it a lot faster when the output is provided
+        # I have read that using clip or wrap mode make it a lot faster when
+        # the output is provided
         out[0] = x.take(i, axis=0, out=o)
 
     def grad(self, inputs, grads):