docs: technical feedback

(cherry picked from commit d5ff8f2)

Author: james

docs/language/ql-handbook/expressions.rst

@@ -407,8 +407,8 @@ In general, if the ``<expression>`` is total and functional, then monotonic aggr
 equivalent to standard aggregates. Results differ when there is not precisely one ``<expression>`` 
 value for each value generated by the ``<formula>``:
 
-- If there are missing ``<expression>`` values (that is, there is less than one 
-  ``<expression>`` value for each value generated by the ``<formula>``), monotonic aggregates 
+- If there are missing ``<expression>`` values (that is, there is no 
+  ``<expression>`` value for a value generated by the ``<formula>``), monotonic aggregates 
   won't compute a result, as you cannot create combinations of values  
   including exactly one ``<expression>`` value for each value generated by the ``<formula>``.