Documentation how to setup ownCloud with nginx, at least a good start
The nginx documentation has been removed from owncloud docs
Here you can find it again
Install a Asciidoctor preview plugin like Asciidoctor.js Live Preview for your browser, open
nginx_configuration.adoc click "Raw" to see the rendered documentation
Some additional / helpful info regarding nginx and ownCloud added.
Please also see: https://github.com/mmattel/nginx-setup