Document behavior for empty default permissions

Author: Zephyrkul

discord/app_commands/commands.py

@@ -468,6 +468,8 @@ class Command(Generic[GroupT, P, T]):
     default_permissions: Optional[:class:`~discord.Permissions`]
         The default permissions that can execute this command on Discord. Note
         that server administrators can override this value in the client.
+        Setting an empty permissions field will disallow anyone except server
+        administrators from using the command in a guild.
 
         Due to a Discord limitation, this does not work on subcommands.
     guild_only: :class:`bool`
@@ -874,6 +876,8 @@ class ContextMenu:
     default_permissions: Optional[:class:`~discord.Permissions`]
         The default permissions that can execute this command on Discord. Note
         that server administrators can override this value in the client.
+        Setting an empty permissions field will disallow anyone except server
+        administrators from using the command in a guild.
     guild_only: :class:`bool`
         Whether the command should only be usable in guild contexts.
         Defaults to ``False``.
@@ -1025,6 +1029,8 @@ class shortened to 100 characters.
     default_permissions: Optional[:class:`~discord.Permissions`]
         The default permissions that can execute this group on Discord. Note
         that server administrators can override this value in the client.
+        Setting an empty permissions field will disallow anyone except server
+        administrators from using the command in a guild.
 
         Due to a Discord limitation, this does not work on subcommands.
     guild_only: :class:`bool`
@@ -1828,6 +1834,9 @@ def default_permissions(**perms: bool) -> Callable[[T], T]:
     However, an administrator can change the permissions needed to execute this command using the official
     client. Therefore, this only serves as a hint.
 
+    Setting an empty permissions field, including via calling this with no arguments, will disallow anyone
+    except server administrators from using the command in a guild.
+
     This is sent to Discord server side, and is not a :func:`check`. Therefore, error handlers are not called.
 
     Due to a Discord limitation, this decorator does nothing in subcommands and is ignored.