Fix chaining example in docs.

[BrianPugh]

Addresses #213

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.39%. Comparing base (b862234) to head (cc14aae).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
- Coverage   95.49%   95.39%   -0.10%     
==========================================
  Files          23       23              
  Lines        2107     2107              
  Branches      539      539              
==========================================
- Hits         2012     2010       -2     
- Misses         46       47       +1     
- Partials       49       50       +1     

Flag	Coverage Δ
unittests	95.15% <ø> (-0.05%)	⬇️

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