Describe subscription cancellation by read() operation

Author: Daisuke Baba

src/locales/en-US/generic-ble.html

@@ -26,6 +26,8 @@ <h3>Inputs</h3>
 <dd>
 You can set one or more characteristic uuids separated by comma (CSV) to query to <code>msg.topic</code>.
 However, leave <code>msg.topic</code> empty if you want to query all readable characteristics.
+
+<b>Note that the Read operation to the subscribing uuids cancels the subscriptions.</b>
 </dd>
 <dt>For subscribing <code>Notify</code> events:</dt>
 <dd>