Python: Apply suggestions from code review

Co-authored-by: yoff <[email protected]>

Author: RasmusWL

python/change-notes/2021-10-08-add-dataflow-for-boolean-expressions.md

@@ -1,3 +1,3 @@
 lgtm,codescanning
-* Added data-flow from `x` in both `x or y` and `x and y`, as described in the
+* Added data-flow from both `x` and `y` to `x or y` and `x and y`, as a slight over-approximation of what is described in the
   [Python Language Reference](https://docs.python.org/3/reference/expressions.html#boolean-operations).