add missing `.`
@@ -719,7 +719,7 @@ class FormValidationAction(Action, ABC):
`tracker.get_slot(slot_name)`, the most recent user message
is `tracker.latest_message.text` and any other
`rasa_sdk.Tracker` property.
- domain: the bot's domain
+ domain: the bot's domain.
Returns:
`SlotSet` for any extracted slots.
