[fix the :help docs for :set stop (#2737)
Simon Marlow <marlowsd@gmail.com>**20081104092929] hunk ./compiler/ghci/InteractiveUI.hs 258
- "   :set stop <cmd>             set the command to run when a breakpoint is hit\n" ++
+ "   :set stop [<n>] <cmd>       set the command to run when a breakpoint is hit\n" ++