gb_sets: group aliased functions in documentation

[Maria-12648430]

In gb_sets, the functions add_element/2, del_element/2 and is_element/2 are aliases for add/2, delete_any/2 and is_member/2 respectively, added for compatibility with sets and ordsets.

While add_element/2 and add/2 were grouped together into the same paragraph, del_element/2/delete_any/2 and is_element/2/is_member/2 were in distinct paragraphs (with duplicate content), giving the impression that there was some kind of difference between them.

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[bjorng]

Thanks for the pull request. I suggest that you also group difference/2 and subtract/2.

[Maria-12648430]

Oops, I missed that one 😅

[Maria-12648430]

Done.

Btw, while I'm at it: The docs for insert/2 and delete/2 rather laconically state that they assume that Elementis (not) present in Set1. Is it worth elaborating/rephrasing that an error will be thrown in those cases?

[bjorng]

Is it worth elaborating/rephrasing that an error will be thrown in those cases?

In my opinion, no. I find the current description clear enough.

[bjorng]

Thanks for your pull request.