Docs: Black icons invisible with Firefox-extension "Dark background and light text"

[Jonathan Laschet <jontajonta () gmail com>]

https://www.wireshark.org/docs/wsug_html_chunked/PrefaceTypographicConventions.html

for example

Extension:

https://addons.mozilla.org/en-US/firefox/addon/dark-background-light-text/

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