docs(dispatcher): use RFC 2606 domains in interceptor examples

[nthbotast]

What

• replace http://example.com with http://service.example in Dispatcher interceptor examples
• keep sample semantics unchanged while using RFC 2606-reserved domains

Why

Issue #4866 asks to avoid non-RFC2606 examples in docs/tests. This updates the Dispatcher docs section to use a reserved .example domain.

Validation

• git diff --check

Partially addresses #4866.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.03%. Comparing base (fb05ad6) to head (7932f6f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4873   +/-   ##
=======================================
  Coverage   93.02%   93.03%           
=======================================
  Files         112      112           
  Lines       35176    35176           
=======================================
+ Hits        32723    32726    +3     
+ Misses       2453     2450    -3     

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[mcollina]

lgtm