Copy edit GattServerEvents.h

Make minor copy edits for active voice, brevity and comma use.

Author: Amanda Butler

features/FEATURE_BLE/ble/GattServerEvents.h

@@ -35,12 +35,12 @@ class GattServerEvents
 {
 public:
     /**
-     * Enumeration of events which can be generated by a GattServer
-     * implementation.
+     * Enumeration of events, which a GattServer
+     * implementation can generate.
      */
     typedef enum gattEvent_e {
         /**
-         * Fired when a server event was successfully sent out.
+         * Fired when a server event was successfully sent.
          */
         GATT_EVENT_DATA_SENT = 1,