Fill in placeholder javadoc for DisconnectionRequestManager listener methods

The addListener and removeListener methods had `@param accountIdentifier TODO`
and `@param deviceId TODO` placeholders in their javadoc. Replace them with
descriptions consistent with the style used elsewhere in the same class
(e.g. `requestDisconnection`).

Author: gabrysh

service/src/main/java/org/whispersystems/textsecuregcm/auth/DisconnectionRequestManager.java

@@ -121,8 +121,8 @@ public synchronized void stop() {
   /**
    * Adds a listener for disconnection requests for a specific authenticated device.
    *
-   * @param accountIdentifier TODO
-   * @param deviceId TODO
+   * @param accountIdentifier the identifier of the account associated with the authenticated device
+   * @param deviceId the identifier of the authenticated device
    * @param listener the listener to register
    */
   public void addListener(final UUID accountIdentifier, final byte deviceId, final DisconnectionRequestListener listener) {
@@ -139,8 +139,8 @@ public void addListener(final UUID accountIdentifier, final byte deviceId, final
   /**
    * Removes a listener for disconnection requests for a specific authenticated device.
    *
-   * @param accountIdentifier TODO
-   * @param deviceId TODO
+   * @param accountIdentifier the identifier of the account associated with the authenticated device
+   * @param deviceId the identifier of the authenticated device
    * @param listener the listener to remove
    */
   public void removeListener(final UUID accountIdentifier, final byte deviceId, final DisconnectionRequestListener listener) {