FreeBSD/doc 4ad60d5 (r53132)en_US.ISO8859-1/books/handbook/advanced-networking chapter.xml

Add instructions on how to configure the regulatory domain settings for wifi.

Submitted by:               Albert Dengg
Event:                      Vienna Hackathon 2019
Differential Revision:      https://reviews.freebsd.org/D20573
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+21-0en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
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