Update known errors and error message

Closes #1713

telethon/client/chats.py

@@ -1274,7 +1274,7 @@ async def get_stats(
         """
         entity = await self.get_input_entity(entity)
         if helpers._entity_type(entity) != helpers._EntityType.CHANNEL:
-            raise TypeError('You must pass a user entity')
+            raise TypeError('You must pass a channel entity')
 
         # Don't bother fetching the Channel entity (costs a request), instead
         # try to guess and if it fails we know it's the other one (best case

telethon_generator/data/errors.csv

@@ -108,6 +108,7 @@ ENCRYPTION_OCCUPY_FAILED,500,TDLib developer claimed it is not an error while ac
 ENTITIES_TOO_LONG,400,It is no longer possible to send such long data inside entity tags (for example inline text URLs)
 ENTITY_MENTION_USER_INVALID,400,You can't use this entity
 ERROR_TEXT_EMPTY,400,The provided error message is empty
+EXPIRE_FORBIDDEN,400,
 EXPORT_CARD_INVALID,400,Provided card is invalid
 EXTERNAL_URL_INVALID,400,External URL invalid
 FIELD_NAME_EMPTY,400,The field with the name FIELD_NAME is missing
@@ -176,6 +177,7 @@ MEDIA_EMPTY,400,The provided media object is invalid or the current account may
 MEDIA_INVALID,400,Media invalid
 MEDIA_NEW_INVALID,400,The new media to edit the message with is invalid (such as stickers or voice notes)
 MEDIA_PREV_INVALID,400,The old media cannot be edited with anything else (such as stickers or voice notes)
+MEDIA_TTL_INVALID,400,
 MEGAGROUP_ID_INVALID,400,The group is invalid
 MEGAGROUP_PREHISTORY_HIDDEN,400,You can't set this discussion group because it's history is hidden
 MEGAGROUP_REQUIRED,400,The request can only be used with a megagroup channel