Explain how to remove URL restrictions in the play error message (#6348)

Co-authored-by: aikaterna <[email protected]>
Co-authored-by: Jakub Kuczys <[email protected]>

redbot/cogs/audio/core/commands/player.py

@@ -50,7 +50,9 @@ async def command_play(self, ctx: commands.Context, *, query: str):
                 return await self.send_embed_msg(
                     ctx,
                     title=_("Unable To Play Tracks"),
-                    description=_("That URL is not allowed."),
+                    description=_(
+                        "That URL is not allowed.\n\nThe bot owner can remove this restriction by using ``{prefix}audioset restrict``."
+                    ).format(prefix=ctx.clean_prefix),
                 )
         elif not await self.is_query_allowed(self.config, ctx, f"{query}", query_obj=query):
             return await self.send_embed_msg(