[commands] Document the thread converter

docs/ext/commands/api.rst

@@ -405,6 +405,9 @@ Converters
 .. autoclass:: discord.ext.commands.PartialEmojiConverter
     :members:
 
+.. autoclass:: discord.ext.commands.ThreadConverter
+    :members:
+
 .. autoclass:: discord.ext.commands.clean_content
     :members:
 
@@ -512,6 +515,9 @@ Exceptions
 .. autoexception:: discord.ext.commands.ChannelNotReadable
     :members:
 
+.. autoexception:: discord.ext.commands.ThreadNotFound
+    :members:
+
 .. autoexception:: discord.ext.commands.BadColourArgument
     :members:
 
@@ -611,6 +617,7 @@ Exception Hierarchy
                     - :exc:`~.commands.EmojiNotFound`
                     - :exc:`~.commands.PartialEmojiConversionFailure`
                     - :exc:`~.commands.BadBoolArgument`
+                    - :exc:`~.commands.ThreadNotFound`
                     - :exc:`~.commands.FlagError`
                         - :exc:`~.commands.BadFlagArgument`
                         - :exc:`~.commands.MissingFlagArgument`

docs/ext/commands/commands.rst

@@ -392,6 +392,7 @@ A lot of discord models work out of the gate as a parameter:
 - :class:`Colour`
 - :class:`Emoji`
 - :class:`PartialEmoji`
+- :class:`Thread` (since v2.0)
 
 Having any of these set as the converter will intelligently convert the argument to the appropriate target type you
 specify.
@@ -438,6 +439,8 @@ converter is given below:
 +--------------------------+-------------------------------------------------+
 | :class:`PartialEmoji`    | :class:`~ext.commands.PartialEmojiConverter`    |
 +--------------------------+-------------------------------------------------+
+| :class:`Thread`          | :class:`~ext.commands.ThreadConverter`          |
++--------------------------+-------------------------------------------------+
 
 By providing the converter it allows us to use them as building blocks for another converter: