fix docstring

Author: ARF

bquery/transformers.py

@@ -54,12 +54,12 @@ def apply(self, ctable_, node, user_dict):
 
 
 class InOperatorTransformer(QueryTransformer):
-    """A :class:`QueryTransformer` that converts comparisons with `in` 
-    operators into expressions using `==` and `!=`.
+    """A :class:`QueryTransformer` that converts comparisons with `in` and 
+    `not in` operators into expressions using `==` and `!=`.
 
     Example:
         `my_col in ['ABC', 'DEF']` is transformed into
-        `(my_col == 'ABC' | my_col == 'DEF')`
+        `(my_col == 'ABC') | (my_col == 'DEF')`
     
     This is useful as Numexpr currently does not support `in` operators."""