Fix line-lenght

docs/usage.txt

@@ -49,7 +49,10 @@ Filters take a ``lookup_type`` argument which specifies what lookup type to
 use with Django's ORM.  So here when a user entered a price it would show all
 Products with a price less than that.
 
-**It's quite common to forget to set lookup type for `CharField`s/`TextField`s and wonder why search for "foo" doesn't return result for "foobar". It's because default lookup type is exact text, but you probably want `icontains` lookup field.**
+**It's quite common to forget to set lookup type for `CharField`s/`TextField`s
+and wonder why search for "foo" doesn't return result for "foobar". It's because
+default lookup type is exact text, but you probably want `icontains` lookup
+field.**
 
 Items in the ``fields`` sequence in the ``Meta`` class may include
 "relationship paths" using Django's ``__`` syntax to filter on fields on a