Undocumented predicates

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

 lead_add(Arg1, Arg2, Arg3)

 lead_add(Arg1, Arg2, Arg3, Arg4)

 lead_get(Arg1, Arg2, Arg3)

 lead_get(Arg1, Arg2, Arg3, Arg4)

 lead_list(Arg1, Arg2, Arg3)

 lead_list(Arg1, Arg2, Arg3, Arg4)

 lead_update(Arg1, Arg2, Arg3, Arg4)

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

 activity_add(Arg1, Arg2, Arg3)

 activity_add(Arg1, Arg2, Arg3, Arg4)

 activity_list(Arg1, Arg2, Arg3)

 activity_list(Arg1, Arg2, Arg3, Arg4)

 contact_add(Arg1, Arg2, Arg3)

 contact_add(Arg1, Arg2, Arg3, Arg4)

 deal_list(Arg1, Arg2, Arg3)

 deal_list(Arg1, Arg2, Arg3, Arg4)

 contact_list(Arg1, Arg2, Arg3)

 contact_list(Arg1, Arg2, Arg3, Arg4)

 duplicate_find_by_comm(Arg1, Arg2, Arg3)

 duplicate_find_by_comm(Arg1, Arg2, Arg3, Arg4)

 lead_contact_add(Arg1, Arg2, Arg3, Arg4)

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

 lead_contact_items_get(Arg1, Arg2, Arg3)

 lead_contact_items_get(Arg1, Arg2, Arg3, Arg4)

 lead_productrows_set(Arg1, Arg2, Arg3, Arg4)

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

 product_list(Arg1, Arg2, Arg3)

 product_list(Arg1, Arg2, Arg3, Arg4)