Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 category(Arg1, Arg2)

 Arg1 ^ Arg2

 edge(Arg1, Arg2, Arg3, Arg4, Arg5)

 edge(Arg1, Arg2, Arg3, Arg4, Arg5, Arg6)

 edge_property_value(Arg1, Arg2, Arg3)

 provided_by(Arg1, Arg2)

 provided_by(Arg1, Arg2, Arg3, Arg4)

 relation_count(Arg1, Arg2)

 category_count(Arg1, Arg2)

 chained_provider(Arg1, Arg2, Arg3)

 category_provider_count(Arg1, Arg2, Arg3)

 category_node_property_count(Arg1, Arg2, Arg3)

 category_relation_count(Arg1, Arg2, Arg3)

 category_link_count(Arg1, Arg2, Arg3)

 category_link_count(Arg1, Arg2, Arg3, Arg4)

 category_link_count(Arg1, Arg2, Arg3, Arg4, Arg5)

 chained_edge_provider_count(Arg1, Arg2, Arg3)

 edge_provider_count(Arg1, Arg2)

 provided_by_count(Arg1, Arg2)

 relation_provider_count(Arg1, Arg2, Arg3)