Update docs for silent parameter

Since it now also works in private chats to "not disturb friends"
(see https://telegram.org/blog/silent-messages-slow-mode).

telethon/tl/custom/inlineresult.py

@@ -110,7 +110,10 @@ class InlineResult:
                 If present, the sent message will reply to this ID or message.
 
             silent (`bool`, optional):
-                If `True`, the sent message will not notify the user(s).
+                Whether the message should notify people with sound or not.
+                Defaults to `False` (send with a notification sound unless
+                the person has the chat muted). Set it to `True` to alter
+                this behaviour.
 
             clear_draft (`bool`, optional):
                 Whether the draft should be removed after sending the

telethon/tl/custom/message.py

@@ -44,9 +44,12 @@ class Message(ChatGetter, SenderGetter, TLObject, abc.ABC):
             Whether you have read the media in this message
             or not, e.g. listened to the voice note media.
 
+
         silent (`bool`):
-            Whether this message should notify or not,
-            used in channels.
+            Whether the message should notify people with sound or not.
+            Previously used in channels, but since 9 August 2019, it can
+            also be `used in private chats
+            <https://telegram.org/blog/silent-messages-slow-mode>`_.
 
         post (`bool`):
             Whether this message is a post in a broadcast