docs(firewall): port flag in add/delete-rule usage string

[phm07]

See #733

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.92%. Comparing base (da1b684) to head (29bad22).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #735   +/-   ##
=======================================
  Coverage   59.92%   59.92%           
=======================================
  Files         180      180           
  Lines        6511     6511           
=======================================
  Hits         3902     3902           
  Misses       1991     1991           
  Partials      618      618           

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[jooola]

This change also have an influence on the behavior of the argument validation, correct? Should we scope this as feat or fix ?

I haven't tested it manually, but the code looks good.

[phm07]

This change also have an influence on the behavior of the argument validation, correct? Should we scope this as feat or fix ?

I haven't tested it manually, but the code looks good.

No, the usage validation only checks positional arguments.