Clarify and fix some docstrings

telethon/client/buttons.py

@@ -47,7 +47,8 @@ class ButtonMethods(UpdateMethods):
 
                         self.add_event_handler(
                             button.callback,
-                            events.CallbackQuery(data=button.data)
+                            events.CallbackQuery(data=getattr(
+                                button.button, 'data', None))
                         )
 
                     button = button.button

telethon/client/dialogs.py

@@ -162,9 +162,9 @@ class DialogMethods(UserMethods):
             *, timeout=None, total_timeout=60, max_messages=100,
             replies_are_responses=True):
         """
-        Returns an iterator over the dialogs, yielding 'limit' at most.
+        Creates a `Conversation <telethon.tl.custom.conversation.Conversation>`
-        Dialogs are the open "chats" or conversations with other people,
+        with the given entity so you can easily send messages and await for
-        groups you have joined, or channels you are subscribed to.
+        responses or other reactions. Refer to its documentation for more.
 
         Args:
             entity (`entity`):

telethon/tl/custom/button.py

@@ -4,6 +4,15 @@ from .messagebutton import MessageButton
 
 class Button:
     """
+    .. note::
+
+        This class is used to **define** reply markups, e.g. when
+        sending a message or replying to events. When you access
+        `Message.buttons <telethon.tl.custom.message.Message.buttons>`
+        they are actually `MessageButton
+        <telethon.tl.custom.messagebutton.MessageButton>`,
+        so you might want to refer to that class instead.
+
     Helper class to allow defining ``reply_markup`` when
     sending a message with inline or keyboard buttons.
 
@@ -30,11 +39,6 @@ class Button:
         self.callback = callback
         self.is_inline = self._is_inline(button)
 
-    @property
-    def data(self):
-        if isinstance(self.button, types.KeyboardButtonCallback):
-            return self.button.data
-
     @classmethod
     def _is_inline(cls, button):
         """

telethon/tl/custom/messagebutton.py

@@ -5,6 +5,13 @@ import webbrowser
 
 class MessageButton:
     """
+    .. note::
+
+        `Message.buttons <telethon.tl.custom.message.Message.buttons>`
+        are instances of this type. If you want to **define** a reply
+        markup for e.g. sending messages, refer to `Button
+        <telethon.tl.custom.button.Button>` instead.
+
     Custom class that encapsulates a message button providing
     an abstraction to easily access some commonly needed features
     (such as clicking the button itself).