add test and gotcha for running multiple models at the same time.

[amoodie]

add test and gotcha for running multiple models at the same time.

Adds a section of the "examples" documentation for common "gotchas".

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.02%. Comparing base (4902a9f) to head (693ede9).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #303   +/-   ##
========================================
  Coverage    79.02%   79.02%           
========================================
  Files           12       12           
  Lines         2727     2727           
========================================
  Hits          2155     2155           
  Misses         572      572           

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