Added more documentation on methods and tests

telegrambots-abilities/src/main/java/org/telegram/abilitybots/api/bot/DefaultAbilities.java

@@ -239,6 +239,7 @@ public final class DefaultAbilities implements AbilityExtension {
 
     /**
      * The ability to cancel operation.
+     * User can use this method to cancel the current session and delete related chat.
      * Usage: <code>/cancel</code>
      *
      * @return the ability to cancel operation

telegrambots-abilities/src/test/java/org/telegram/abilitybots/api/bot/AbilityBotTest.java

@@ -200,6 +200,11 @@ public class AbilityBotTest {
     verify(sender, times(1)).sendDocument(any());
   }
 
+
+  /**
+   * This is for TelegramBots Issue 935 test
+   * this test shows that TelegramLongPollingBot can cancel the session by removing map of chatID.
+   */
   @Test
   void canCancel() {
     MessageContext context = defaultContext();