Update Multiple Map Docs and Examples

[shikokuchuo]

In light of #192. Closes #192.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.33%. Comparing base (feac10b) to head (7e9f6e3).
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #193      +/-   ##
==========================================
- Coverage   99.33%   99.33%   -0.01%     
==========================================
  Files           9        9              
  Lines         908      905       -3     
==========================================
- Hits          902      899       -3     
  Misses          6        6              

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