Make context documentation in migration a bit more clear.

docs/migrating.rst

@@ -803,21 +803,25 @@ will either DM the user in a DM context or send a message in the channel it was
 functionality. The old helpers have been removed in favour of the new :class:`abc.Messageable` interface. See
 :ref:`migrating_1_0_removed_helpers` for more information.
 
-Since the :class:`~ext.commands.Context` is now by default passed, several shortcuts have been added:
+Since the :class:`~ext.commands.Context` is now passed by default, several shortcuts have been added:
 
 **New Shortcuts**
 
-- :attr:`~ext.commands.Context.author` is a shortcut for ``ctx.message.author``.
-- :attr:`~ext.commands.Context.guild` is a shortcut for ``ctx.message.guild``.
-- :attr:`~ext.commands.Context.channel` is a shortcut for ``ctx.message.channel``.
-- :attr:`~ext.commands.Context.me` is a shortcut for ``ctx.message.guild.me`` or ``ctx.bot.user``.
-- :attr:`~ext.commands.Context.voice_client` is a shortcut for ``ctx.message.guild.voice_client``.
+- :attr:`ctx.author <ext.commands.Context.author>` is a shortcut for ``ctx.message.author``.
+- :attr:`ctx.guild <ext.commands.Context.guild>` is a shortcut for ``ctx.message.guild``.
+- :attr:`ctx.channel <ext.commands.Context.channel>` is a shortcut for ``ctx.message.channel``.
+- :attr:`ctx.me <ext.commands.Context.me>` is a shortcut for ``ctx.message.guild.me`` or ``ctx.bot.user``.
+- :attr:`ctx.voice_client <ext.commands.Context.voice_client>` is a shortcut for ``ctx.message.guild.voice_client``.
 
 **New Functionality**
 
-- :meth:`~.Context.reinvoke` to invoke a command again.
+- :meth:`.Context.reinvoke` to invoke a command again.
 
     - This is useful for bypassing cooldowns.
+- :attr:`.Context.valid` to check if a context can be invoked with :meth:`.Bot.invoke`.
+- :meth:`.Context.send_help` to show the help command for an entity using the new :class:`~.ext.commands.HelpCommand` system.
+
+    - This is useful if you want to show the user help if they misused a command.
 
 Subclassing Context
 ++++++++++++++++++++