Broken link to HttpRedisModule

[parkerfath]

The link on

openresty.org/v2/en/redis-nginx-module.md

Line 22 in 46548c0

Documentation wiki page: http://wiki.nginx.org/HttpRedisModule

appears to be a broken link - it goes to an archived nginx wiki.

I'm not really sure where this is supposed to point, otherwise I'd post an MR. Not sure if the OpenResty Redis Nginx Module is deprecated or something.