fix: generic webhook receiver doc examples

[fuskovic]

Closes: #5666

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.15%. Comparing base (5ad52df) to head (651065f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5704   +/-   ##
=======================================
  Coverage   56.15%   56.15%           
=======================================
  Files         448      448           
  Lines       37658    37658           
=======================================
  Hits        21145    21145           
  Misses      15256    15256           
  Partials     1257     1257           

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