Mention that higher-order recursive operators are a bug

[zwergziege]

The page on operators contains an example that features a higher-order recursive operator, which is illegal. I know it was deemed more of a happy coincidence and remains untouched for now, but it gets confusing if you write specs like

RECURSIVE Bug(_,_)
Bug(a,b(_)) == 1

which is not covered by the bug and produces an error message, which I in turn thought was a bug until I realized that HOROs are illegal in the first place. Apparently, there's a bug in the bug. To avoid such confusion it would be nice if the page would contain a short note that HOROs are a bug / not actually supported.
Suggestion:

{{% notice note %}} While technically TLA+ does not permit recursive higher-order operators (like the one above) TLC partially supports them due to a bug {{% /notice %}}

I know it was filed by the author of the page, but for the sake of completeness: tlaplus/tlaplus#57