[Merged by Bors] - feat(topology/order): upgrade some lemmas to iff
s
#15617
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continuous_induced_rng
,continuous_coinduced_dom
,continuous_sup_dom
,continuous_Sup_dom
,continuous_supr_dom
,continuous_inf_rng
,continuous_Inf_rng
, andcontinuous_infi_rng
intoiff
s;continuous_induced_rng'
;is_open_sup
.To make the diff smaller, no other API changes go to this PR.