Minor language tweak (#1178)

developers/bindings/index.md

@@ -662,7 +662,7 @@ The following table gives an overview about the main parts of a `DiscoveryResult
 | `label` | The human readable representation of the discovery result. Do not put IP/MAC addresses or similar into the label but use the special `representationProperty` instead. |
 | `representationProperty` | The name of one of the properties which discriminates the discovery result best against other results of the same type. Typically this is a serial number, IP or MAC address. The representationProperty often matches a configuration parameter and is also explicitly given in the thing-type definition. |
 
-To simplify the implementation of own discovery services, an abstract base class `AbstractDiscoveryService` implements the `DiscoveryService`, that must only be extended.
+To simplify the implementation of custom discovery services, an abstract base class `AbstractDiscoveryService` implements the `DiscoveryService` and just needs to be extended.
 Subclasses of `AbstractDiscoveryService` do not need to handle the `DiscoveryListeners` themselves, they can use the methods `thingDiscovered` and `thingRemoved` to notify the registered listeners.
 Most of the descriptions in this chapter refer to the `AbstractDiscoveryService`.