FreeBSD/doc 7adaf7b (r53423)en_US.ISO8859-1/books/porters-handbook/special chapter.xml

Two language fixes:
- there default settings -> their default settings
- there be -> there must be

PR:             240667
Submitted by:   pauamma at gundo.com
Event:          EuroBSDcon 2019 Hackathon
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+2-2en_US.ISO8859-1/books/porters-handbook/special/chapter.xml
+2-21 files

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