Update docs for ChannelClosed Event

[keyuebao]

For #2997

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.37%. Comparing base (ac9a2c8) to head (d2c1650).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2999      +/-   ##
==========================================
- Coverage   89.42%   89.37%   -0.06%     
==========================================
  Files         117      117              
  Lines       96290    96290              
  Branches    96290    96290              
==========================================
- Hits        86109    86055      -54     
- Misses       7962     8011      +49     
- Partials     2219     2224       +5     

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[TheBlueMatt]

Thanks!