Update docs with references to text in stage

discord/abc.py

@@ -1415,6 +1415,7 @@ class Messageable:
 
     - :class:`~discord.TextChannel`
     - :class:`~discord.VoiceChannel`
+    - :class:`~discord.StageChannel`
     - :class:`~discord.DMChannel`
     - :class:`~discord.GroupChannel`
     - :class:`~discord.User`

discord/message.py

@@ -597,6 +597,7 @@ class PartialMessage(Hashable):
 
     - :meth:`TextChannel.get_partial_message`
     - :meth:`VoiceChannel.get_partial_message`
+    - :meth:`StageChannel.get_partial_message`
     - :meth:`Thread.get_partial_message`
     - :meth:`DMChannel.get_partial_message`
 
@@ -620,7 +621,7 @@ class PartialMessage(Hashable):
 
     Attributes
     -----------
-    channel: Union[:class:`PartialMessageable`, :class:`TextChannel`, :class:`VoiceChannel`, :class:`Thread`, :class:`DMChannel`]
+    channel: Union[:class:`PartialMessageable`, :class:`TextChannel`, :class:`StageChannel`, :class:`VoiceChannel`, :class:`Thread`, :class:`DMChannel`]
         The channel associated with this partial message.
     id: :class:`int`
         The message ID.
@@ -1222,7 +1223,7 @@ class Message(PartialMessage, Hashable):
         This is not stored long term within Discord's servers and is only used ephemerally.
     embeds: List[:class:`Embed`]
         A list of embeds the message has.
-    channel: Union[:class:`TextChannel`, :class:`VoiceChannel`, :class:`Thread`, :class:`DMChannel`, :class:`GroupChannel`]
+    channel: Union[:class:`TextChannel`, :class:`StageChannel`, :class:`VoiceChannel`, :class:`Thread`, :class:`DMChannel`, :class:`GroupChannel`]
         The :class:`TextChannel` or :class:`Thread` that the message was sent from.
         Could be a :class:`DMChannel` or :class:`GroupChannel` if it's a private message.
     call: Optional[:class:`CallMessage`]