[V3 Core] Command group automatic help (#1790)

* decorator inheritence

* black format

* add autohelp

* modify commands to use autohelp

redbot/cogs/admin/admin.py

@@ -157,13 +157,12 @@ class Admin:
         else:
             await self.complain(ctx, USER_HIERARCHY_ISSUE)
 
-    @commands.group()
+    @commands.group(autohelp=True)
     @commands.guild_only()
     @checks.admin_or_permissions(manage_roles=True)
     async def editrole(self, ctx: commands.Context):
         """Edits roles settings"""
-        if ctx.invoked_subcommand is None:
-            await ctx.send_help()
+        pass
 
     @editrole.command(name="colour", aliases=["color"])
     async def editrole_colour(