Cannot find Python function `resource` in documentation

I am trying to add a resource call to a package. I need to know which keywords arguments it expects. I currently cannot find this in the documentation.

I notice two problems:

• When I follow a link in a search result, I end up at the top of a very large page, where I have to search again. I expect to be placed near the term which I searched.
• The two pages spack package and Packaging Guide both describe what I'm probably looking for, but they list different and incomplete keyword arguments. They also don't explain the meaning of the keyword arguments well.
• The notion of a FetchStrategy seems to be important to understanding resources. This term should again be a hyperlink in the API reference, so that I can look up what it means.