Update documentation

Author: Daniel S

doc_src/services.rst

@@ -68,10 +68,14 @@ Validates the postal codes for a given address.
 Pickup Service
 --------------
 
-Creates a fedex pickup request.
+Creates a FedEx pickup request.
 
 .. autoclass:: fedex.services.pickup_service.FedexCreatePickupRequest
 
+Queries pickup availability.
+
+.. autoclass:: fedex.services.pickup_service.FedexPickupAvailabilityRequest
+
 
 Package Movement Service
 ------------------------