I am working on creating an online localized wiki about Linux programs. I am hosting the documents files on GitHub and I would like to choose an open source license for it. The problem is that I don't understand the nature of users' contributions to the repository and whether it's considered like software or not.
For example, when a user sends me a pull request on GitHub and if the license of my documents was CC BY-NC-SA 4.0. Does that mean that everybody won't be able to use the documents for commercial purposes including me? Or I would be the only one allowed to use it however I like even after someone sends me a pull request and I accept it?
Another question is whether taking those documents and putting them in a nice way on a website with installing Google AdSense script is considered to be a commercial use of those docs?