Remove TextChannel.default_thread_slowmode_delay

This doesn't have meaning on text channels apparently

discord/channel.py

@@ -161,10 +161,6 @@ class TextChannel(discord.abc.Messageable, discord.abc.GuildChannel, Hashable):
     default_auto_archive_duration: :class:`int`
         The default auto archive duration in minutes for threads created in this channel.
 
-        .. versionadded:: 2.0
-    default_thread_slowmode_delay: :class:`int`
-        The default slowmode delay in seconds for threads created in this channel.
-
         .. versionadded:: 2.0
     """
 
@@ -182,7 +178,6 @@ class TextChannel(discord.abc.Messageable, discord.abc.GuildChannel, Hashable):
         '_type',
         'last_message_id',
         'default_auto_archive_duration',
-        'default_thread_slowmode_delay',
     )
 
     def __init__(self, *, state: ConnectionState, guild: Guild, data: Union[TextChannelPayload, NewsChannelPayload]):
@@ -212,7 +207,6 @@ class TextChannel(discord.abc.Messageable, discord.abc.GuildChannel, Hashable):
         # Does this need coercion into `int`? No idea yet.
         self.slowmode_delay: int = data.get('rate_limit_per_user', 0)
         self.default_auto_archive_duration: ThreadArchiveDuration = data.get('default_auto_archive_duration', 1440)
-        self.default_thread_slowmode_delay: int = data.get('default_thread_rate_limit_per_user', 0)
         self._type: Literal[0, 5] = data.get('type', self._type)
         self.last_message_id: Optional[int] = utils._get_as_snowflake(data, 'last_message_id')
         self._fill_overwrites(data)
@@ -301,7 +295,6 @@ class TextChannel(discord.abc.Messageable, discord.abc.GuildChannel, Hashable):
         category: Optional[CategoryChannel] = ...,
         slowmode_delay: int = ...,
         default_auto_archive_duration: ThreadArchiveDuration = ...,
-        default_thread_slowmode_delay: int = ...,
         type: ChannelType = ...,
         overwrites: Mapping[OverwriteKeyT, PermissionOverwrite] = ...,
     ) -> TextChannel:
@@ -360,10 +353,6 @@ class TextChannel(discord.abc.Messageable, discord.abc.GuildChannel, Hashable):
             The new default auto archive duration in minutes for threads created in this channel.
             Must be one of ``60``, ``1440``, ``4320``, or ``10080``.
 
-            .. versionadded:: 2.0
-        default_thread_slowmode_delay: :class:`int`
-            The new default slowmode delay in seconds for threads created in this channel.
-
             .. versionadded:: 2.0
 
         Raises