docs: fix shape of expected array in LOO docstring

[penelopeysm]

The docstring has the dimensions in the wrong way round. (PSIS is correct :) https://julia.arviz.org/PSIS/stable/api/#PSIS.psis)

Given that this is just a docs change I'm not sure if you'd like a patch bump, happy to do so if desired.

[devmotion]

Just came across this yesterday as well 🙂

[sethaxen]

Good catch, thanks! Yes, I would say this warrants a patch release.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.32%. Comparing base (bc72f89) to head (3ba0291).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #96   +/-   ##
=======================================
  Coverage   97.32%   97.32%           
=======================================
  Files          16       16           
  Lines         936      936           
=======================================
  Hits          911      911           
  Misses         25       25           

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[sethaxen]

Actually, I'll get it in the same patch release as #95, so no need to bump it here.