Update CallbackQuery docstrings (#1818)

* mark chat_instance as required

* change ordering and add bot

AUTHORS.rst

@@ -36,6 +36,7 @@ The following wonderful people contributed directly or indirectly to this projec
 - `Evan Haberecht <https://github.com/habereet>`_
 - `evgfilim1 <https://github.com/evgfilim1>`_
 - `franciscod <https://github.com/franciscod>`_
+- `gamgi <https://github.com/gamgi>`_
 - `Hugo Damer <https://github.com/HakimusGIT>`_
 - `ihoru <https://github.com/ihoru>`_
 - `Jasmin Bom <https://github.com/jsmnbom>`_

telegram/callbackquery.py

@@ -36,30 +36,31 @@ class CallbackQuery(TelegramObject):
     Attributes:
         id (:obj:`str`): Unique identifier for this query.
         from_user (:class:`telegram.User`): Sender.
+        chat_instance (:obj:`str`): Global identifier, uniquely corresponding to the chat to which
+            the message with the callback button was sent.
         message (:class:`telegram.Message`): Optional. Message with the callback button that
             originated the query.
+        data (:obj:`str`): Optional. Data associated with the callback button.
         inline_message_id (:obj:`str`): Optional. Identifier of the message sent via the bot in
                 inline mode, that originated the query.
-        chat_instance (:obj:`str`): Optional. Global identifier, uniquely corresponding to the chat
-            to which the message with the callback button was sent.
-        data (:obj:`str`): Optional. Data associated with the callback button.
         game_short_name (:obj:`str`): Optional. Short name of a Game to be returned.
+        bot (:class:`telegram.Bot`, optional): The Bot to use for instance methods.
 
     Args:
         id (:obj:`str`): Unique identifier for this query.
         from_user (:class:`telegram.User`): Sender.
+        chat_instance (:obj:`str`): Global identifier, uniquely corresponding to the chat to which
+            the message with the callback button was sent. Useful for high scores in games.
         message (:class:`telegram.Message`, optional): Message with the callback button that
             originated the query. Note that message content and message date will not be available
             if the message is too old.
-        inline_message_id (:obj:`str`, optional): Identifier of the message sent via the bot in
-            inline mode, that originated the query.
-        chat_instance (:obj:`str`, optional): Global identifier, uniquely corresponding to the chat
-            to which the message with the callback button was sent. Useful for high scores in
-            games.
         data (:obj:`str`, optional): Data associated with the callback button. Be aware that a bad
             client can send arbitrary data in this field.
+        inline_message_id (:obj:`str`, optional): Identifier of the message sent via the bot in
+            inline mode, that originated the query.
         game_short_name (:obj:`str`, optional): Short name of a Game to be returned, serves as
             the unique identifier for the game
+        bot (:class:`telegram.Bot`, optional): The Bot to use for instance methods.
 
     Note:
         After the user presses an inline button, Telegram clients will display a progress bar