ContextKey update example code

[breedx-splk]

resolves #7419

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.75%. Comparing base (4a33b66) to head (8ffd659).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7420      +/-   ##
============================================
- Coverage     89.75%   89.75%   -0.01%     
+ Complexity     6981     6980       -1     
============================================
  Files           797      797              
  Lines         21165    21165              
  Branches       2057     2057              
============================================
- Hits          18997    18996       -1     
  Misses         1505     1505              
- Partials        663      664       +1     

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[jkwatson]

Thanks!