[wwwdocs] gcc-4.1/changes.html: Mention optimizer improvements.

[Gerald Pfeifer]

On Thu, 28 Apr 2005, Diego Novillo wrote:
>> Any suggestion for wording?
> It's missing articles.

That, and I wanted to ask Kazu to sync with Diego, but apparently he
is fine with that ;-), so the patch looks fine with these changes.

Gerald