[Docs] Fix antipattern sample code

[peter-csala]

Pull Request

The issue or feature being addressed

#1973

Details on the issue fix or feature implementation

• Mistakenly the sample code used OnFallback instead of FallbackAction

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1ce60b2) 83.64% compared to head (47b6011) 83.64%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1976   +/-   ##
=======================================
  Coverage   83.64%   83.64%           
=======================================
  Files         312      312           
  Lines        7106     7106           
  Branches     1056     1056           
=======================================
  Hits         5944     5944           
  Misses        789      789           
  Partials      373      373           

Flag	Coverage Δ
linux	83.64% <ø> (ø)
macos	83.64% <ø> (ø)
windows	?

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