Replace links to v3-develop docs with links to stable docs (#3186)

* Update customcom.py

* Update permissions.py

* Create 3186.docs.rst

* Create 3186.docs.rst

* Rename 3186.docs.rst to 3186.misc.rst

* Rename 3186.docs.rst to 3186.misc.rst

redbot/cogs/permissions/permissions.py

@@ -135,7 +135,7 @@ class Permissions(commands.Cog):
             "used).\n"
             "  5. Rules about the server a user is in (Global rules only).\n\n"
             "For more details, please read the [official documentation]"
-            "(https://red-discordbot.readthedocs.io/en/v3-develop/cog_permissions.html)."
+            "(https://docs.discord.red/en/stable/cog_permissions.html)."
         )
 
         await ctx.maybe_send_embed(message)