Merge "update docs for Connection#onHold()" into main

    public void onAbort() {}

    /**

     * Notifies this Connection of a request to hold.

     * Notifies this Connection of a request to hold. {@link Connection#setOnHold} should be within

     * the onHold() body in order to transition the call state to {@link Connection#STATE_HOLDING}.

     * <p>

     * Note: If the Connection does not transition to  {@link Connection#STATE_HOLDING} within 2

     * seconds, the call will be disconnected.

     */

    public void onHold() {}