Missing info on how to use RedisSessionHandler

[gisostallenberg]

Related issues only mention a broken link to the github repository. #10011 mentions a link to a how to. How about adding a page describing how to use RedisSessionHandler?

[javiereguiluz]

You are right! This info is missing. We're working on this on #12325, which is part of our ongoing efforts to improve all the docs related to databases (such as "sessions + databases"). I'm closing this one in favor of the mentioned pull request. Thanks.