[docs] [issue30004] in regex-howto, improve example on grouping

Cristian Barbarosie added the comment: Just discovered that a nearly identical example is presented in the end of section "Non-capturing and Named Groups". My proposal applies to this other example, too. And, by the way, reading this HOWTO has been very useful to me. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue30004> _______________________________________