[FIX] doc: Change one last instance of date_end to date_stop

References to `date_end`
were previously corrected to `date_stop`,
in revision 98bd673202,
but one of them was missed.

Closes #4463

doc/reference/views.rst

@@ -942,7 +942,7 @@ calendar view are:
     ``date_stop`` is provided records become movable (via drag and drop)
     directly in the calendar
 ``date_delay``
-    alternative to ``date_end``, provides the duration of the event instead of
+    alternative to ``date_stop``, provides the duration of the event instead of
     its end date
 
     .. todo:: what's the unit? Does it allow moving the record?