That was an error in cppreference; there are no templated finds for unordered associated containers.
Compare, from n3690,
from §23.5.4.1[unord.map.overview]
// lookup
iterator find(const key_type& k);
const_iterator find(const key_type& k) const;
size_type count(const key_type& k) const;
from §23.4.4.1[map.overview]
// 23.4.4.5, map operations:
iterator find(const key_type& x);
const_iterator find(const key_type& x) const;
template <class K> iterator find(const K& x);
template <class K> const_iterator find(const K& x) const;
size_type count(const key_type& x) const;