Added some docstring

Author: eunwoo1104

discord_slash/client.py

@@ -327,6 +327,10 @@ def add_slash_command(self,
         """
         Registers slash command to SlashCommand.
 
+        .. warning::
+            Just using this won't register slash command to Discord API.
+            To register it, check :meth:`.utils.manage_commands.add_slash_command` or simply enable `sync_commands`.
+
         :param cmd: Command Coroutine.
         :type cmd: Coroutine
         :param name: Name of the slash command. Default name of the coroutine.

discord_slash/context.py

@@ -196,6 +196,9 @@ def send_hidden(self, content: str = ""):
         Sends hidden response.\n
         This is automatically used if you pass ``hidden=True`` at :meth:`.send`.
 
+        .. note::
+            This is not intended to be manually called. Please use :meth:`.send` instead.
+
         :param content: Message content.
         :return: Coroutine
         """