Documentation for which_one_of is not showing correctly

[gabeseltzer]

Description

I noticed that the docs for which_one_of is not showing correctly, see this link

Steps to Reproduce

(just go to the website)

Expected Behaviour

It should have a heading and the other data that the other methods have.

Actual Behaviour

All I see is is the "Returns" header:

Environment

(none)

Checklist

• I have searched existing issues for duplicates.