Strange links in docs

Something I don't understand. An example is here:

I can right click on FnOnce and open it in a new tab, but if I just click on the link nothing happens.
It's not specific to this document, it's quite general to all docs at, although it seems to only happen with links in method declarations ( I haven't looked at exactly which links are affected ).

Is this deliberate or some kind of bug? Or am I just confused.

Probably an instance of

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