Update waiter description: change returned to raised for accuracy

[tim-finnigan]

Fixes: #3193

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.15%. Comparing base (c68aa1a) to head (e0f04ab).
Report is 96 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3196      +/-   ##
===========================================
+ Coverage    93.12%   93.15%   +0.03%     
===========================================
  Files           66       66              
  Lines        14252    14287      +35     
===========================================
+ Hits         13272    13309      +37     
+ Misses         980      978       -2     

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