Update Approval Documentation and Approver Dropdown

Although the Approver for an Approval process element must be a Contact, the documentation only refers to employees and users.  Also, the dropdown list for Approver only contains User, Employee's manager and Role, not Contact.  This is very confusing when trying to set up approvals. Please update the documentation and dropdown list to be consistent with the functionality of the application.

[Approver] – specify the approver user. Approver can be a specific employee, manager of a specific employee, or any employee who is a member of a bpm’online organizational or functional role.
 
If you select “Employee”, specify bpm’online user who is the approver in the [Employee] field.
 
If you select “Employee's manager”, specify bpm’online user whose direct superior is the approver. Direct superior is specified in the [Manager] profile of the employee's record in the [Employees] section.