docs - fix code example (historical_model)

[kfsz]

Description

Fixes code example in docs to produce expected output.

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run the pre-commit run command to format and lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.23%. Comparing base (864bda7) to head (6d7cb73).
Report is 216 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1069   +/-   ##
=======================================
  Coverage   97.23%   97.23%           
=======================================
  Files          23       23           
  Lines        1231     1231           
  Branches      199      199           
=======================================
  Hits         1197     1197           
  Misses         16       16           
  Partials       18       18           

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[ddabble]

Very nice! 😄