[doc] A short announce

[姚伟斌]

Good, thanks for your hard work.

2012/3/8 Ruslan Ermilov <ru at nginx.com>:
> We've made an alphabetical index of nginx directives available at
>        http://nginx.org/en/docs/dirindex.html
>
> And if you'd like to go straight to the description of a particular
> directive, here's a short way:
>        http://nginx.org/r/proxy_http_version
> (Substitute any other directive instead of "proxy_http_version".)
>
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