Adjustments to deps/Procurers reference.

[owenRiddy]

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= Justifications

• Added a table, easier for readers to skim.
• It can be unclear if a concept being referenced is a 3rd party one (like S3) or a Clojure one (like the root deps.edn). I tried to be specific with terminology and added some cross-references.
• Outlining the coord keys in the Git procurer duplicates documentation in the Dependencies heading and obscures the fact that :git/url is optional. I think this is can be adequately covered with a cross-reference.

= Questions

There is a sentence in the reference that says "tools.deps.alpha is designed to support an extensible set of procurers that can expand over time". Is this something Clojure programmers expect to use & if so is there documentation or a tutorial on how to extend tools.deps.alpha with a new procurer that I can link? If it isn't a user-facing feature I'd like to prune that line.

What was "using the first attribute qualifier that's found (ignoring the reserved qualifier "deps") meant to be conveying & is it important? I scanned the source code and didn't see why a :deps key would be reserved in a coordinate.

= Future Work

The Procurers section talks about how to configure 3rd party software like S3 & Maven. If there isn't any push-back I'd like to move this into the Deps & cli guide, which would slim down the Procurer section. Then move the entire thing up near the top of the page near to where deps.edn is explained.

[puredanger]

I've incorporated some of these comments on the page, along with many of my own modifications. It was difficult to separate all of those out so I haven't merged this directly, but I appreciate the push in improving this area of the docs.