Document the changes in automation feature in the help center

- Write down the new events, conditions that are supported
- Give a real-world example for these conditions.

> For eg: If a new conversation is created from a particular company say google.com, assign those conversations to the priority-support team.
>
> Event -> conversation.created
> Conditions -> Status = Open && Contact.email includes google.com
> Actions -> Assign to team 'priority-support'