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

* decorator inheritence

* black format

* add autohelp

* modify commands to use autohelp

redbot/cogs/warnings/warnings.py

@@ -41,13 +41,12 @@ class Warnings:
         except RuntimeError:
             pass
 
-    @commands.group()
+    @commands.group(autohelp=True)
     @commands.guild_only()
     @checks.guildowner_or_permissions(administrator=True)
     async def warningset(self, ctx: commands.Context):
         """Warning settings"""
-        if ctx.invoked_subcommand is None:
-            await ctx.send_help()
+        pass
 
     @warningset.command()
     @commands.guild_only()
@@ -59,13 +58,12 @@ class Warnings:
             _("Custom reasons have been {}.").format(_("enabled") if allowed else _("disabled"))
         )
 
-    @commands.group()
+    @commands.group(autohelp=True)
     @commands.guild_only()
     @checks.guildowner_or_permissions(administrator=True)
     async def warnaction(self, ctx: commands.Context):
         """Action management"""
-        if ctx.invoked_subcommand is None:
-            await ctx.send_help()
+        pass
 
     @warnaction.command(name="add")
     @commands.guild_only()
@@ -136,13 +134,12 @@ class Warnings:
             else:
                 await ctx.send(_("No action named {} exists!").format(action_name))
 
-    @commands.group()
+    @commands.group(autohelp=True)
     @commands.guild_only()
     @checks.guildowner_or_permissions(administrator=True)
     async def warnreason(self, ctx: commands.Context):
         """Add reasons for warnings"""
-        if ctx.invoked_subcommand is None:
-            await ctx.send_help()
+        pass
 
     @warnreason.command(name="add")
     @commands.guild_only()