Add models.utils to Docs

[liopeer]

Changes

• add the module lightly.models.utils to the docs where it has been missing so far

Screenshot

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.21%. Comparing base (ce51134) to head (57c4b0c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1738   +/-   ##
=======================================
  Coverage   85.21%   85.21%           
=======================================
  Files         162      162           
  Lines        6708     6708           
=======================================
  Hits         5716     5716           
  Misses        992      992           

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[guarin]

Nice!