Concisely refer to multiple predicates that have the same name but different arity

[wouterbeek]

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It is currently not possible to concisely refer to multiple predicates that have the same name but different arity.

Example: “The use can assert new alias-to-prefix mappings with rdf_register_prefix/[2,3].”

Intended behavior: rdf_register_prefix/[2,3] should become a link that refers to the concatenation of the documentation for rdf_register_prefix/2 and rdf_register_prefix/3.