HashSet::hasher: Malformed weblink to BuildHasher

[mglagla]

The link to BuildHasher in the documentation of HashSet::hasher is broken and returns a "Not Found" page.

[est31]

This is known and included as exception in the linkchecker code. The code references issue #32130 for this, not sure whether this issue should be closed as dupe or not...

[Mark-Simulacrum]

Yes, I don't see a reason to track this separately.