Robert Goldman requested to merge add-already-loaded-systems-doc into master

There was an @findex entry for this function, but no documentation. Added that. This likely is not where the doc for this function should go.

I will probably just merge this, but any reviewers are welcome to suggest that I move this documentation to a different location.

Assigning this to you @frideau so that you see it. Feel free to ignore if you don't have time; it's a micro-change.

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