Ask HN: Google docs vs. GitHub Wiki/Markdowns

In my company, we need to write down

1. Steps needed to run the apps for multiple environments 2. Staging/Production configurations and related steps to configure 3. List of servers with there addresses 4. Third party service settings and configuration data

I find it's hard to use a single Google Doc for all these. I think using GitHub wiki would be better as it deals with simple markdown text files, also linking, discoverability, code highlighting is bonus

What do you use and what is appropriate for this case? Also what are merits and demerits of each approach.