bug#43758: Typo in 'flymake' info

[Eli Zaretskii]

> From: Pankaj Jangid <pankaj@codeisgreat.org>
> Date: Fri, 02 Oct 2020 16:19:45 +0530
> 
> I was reading 'flymake' documentation and found this typo. A sentence
> was starting with - "If might be good idea to ...". "If" should be
> "It". The docs are basically talking about mapping ‘M-n’ and ‘M-p’ keys
> to 'flymake-goto-next-error and'flymake-goto-prev-error respectively.

Thanks, fixed on the emacs-27 branch.