Small grammar fix

docs/forms.txt

@@ -37,7 +37,7 @@ apple "ball cat" dog   ``["apple", "ball cat", "dog"]``  No commas, so space del
 ``commit=False``
 ~~~~~~~~~~~~~~~~
 
-If, when saving a form you use the ``commit=False`` option you'll need to call
+If, when saving a form, you use the ``commit=False`` option you'll need to call
 ``save_m2m()`` on the form after you save the object, just as you would for a
 form with normal many to many fields on it::