Fix short help in docstrings for core cogs and commands (#5502)

* fix part of command description not appearing in the help command.

* Add more

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

redbot/cogs/economy/economy.py

@@ -853,6 +853,7 @@ class Economy(commands.Cog):
     @economyset.command()
     async def rolepaydayamount(self, ctx: commands.Context, role: discord.Role, creds: int):
         """Set the amount earned each payday for a role.
+
         Set to `0` to remove the payday amount you set for that role.
 
         Only available when not using a global bank.