ADD section regarding reg/subs and service paths to documentation (#3062)
ADD section regarding reg/subs and service paths to documentation (#3062)

* ADD section regarding reg/subs and service paths to documentation

* FIX typo raised in review

Fiware/data.Orion,McMutton/fiware-orion,McMutton/fiware-orion,McMutton/fiware-orion,McMutton/fiware-orion,McMutton/fiware-orion,Fiware/data.Orion,McMutton/fiware-orion,telefonicaid/fiware-orion,telefonicaid/fiware-orion,Fiware/data.Orion,McMutton/fiware-orion,telefonicaid/fiware-orion,telefonicaid/fiware-orion,telefonicaid/fiware-orion,Fiware/data.Orion,telefonicaid/fiware-orion,Fiware/data.Orion,Fiware/data.Orion