Misc clarity for 3rd party appservice protocols/locations

specification/application_service_api.rst

@@ -184,13 +184,14 @@ Third party networks
 ++++++++++++++++++++
 
 Application services may declare which protocols they support via their registration
-file. These networks are generally for third party services such as IRC that the
-application service is managing. Application services may populate a Matrix room
-directory for their registered protocols, as defined in the Client-Server API Extensions.
-
-Each protocol may have several "locations". A location within a protocol is a place
-in the third party network, such as an IRC channel. Users of the third party network
-may also be represented by the application service.
+configuration for the homeserver. These networks are generally for third party services
+such as IRC that the application service is managing. Application services may populate
+a Matrix room directory for their registered protocols, as defined in the Client-Server
+API Extensions.
+
+Each protocol may have several "locations" (also known as "third party locations" or "3PLs").
+A location within a protocol is a place in the third party network, such as an IRC channel.
+Users of the third party network may also be represented by the application service.
 
 Locations and users can be searched by fields defined by the application service, such
 as by display name or other attribute. When clients request the homeserver to search