API methods name adjustments

To allow users to easier understand the differences between the Fleet Server and Fleet Client API methods more, we changed the names of a few methods to give a better idea of what they stand for.

Fleet Server API

Update Order –> Order Details Update. The intention is to highlight the meaning of this method: it is triggered by Gett whenever order details are being changed and a partner is being updated about the changes.

Cancel Order –> Order Cancellation. The intention is to clarify that this method is used to notify a partner about an order cancellation decision that was made.

Fleet Client API

Update Order –> Update Order Progress. The intention is to highlight that this method is about letting a partner report progress during an order lifetime: changes in driver location, driver ETA, order status, order price, etc.