mention the option of directly fetching the archive files when creating new jails

[albert_fsfe.org]

Summary

Currently, the description only mentions fetching the archives from the ISO, however imho it is more convenient
in some cases to directly fetch them from the mirrors

[bcr]

A few minor nits. I like the use of <replaceable>s to be future proof.

en_US.ISO8859-1/books/handbook/jails/chapter.xml

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(On Diff #58392)

s/Alternativly/Alternatively/

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(On Diff #58392)

You can probably remove this line as the previous one already mentions the mirror, so it should be clear to the reader what to do.

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(On Diff #58392)

Do you need to switch to sh to do the exports or can the default shell also be used here?

[albert_fsfe.org]

i fixed the typo and followed the recommendation to remove redundant information about selecting a mirror

[albert_fsfe.org]

en_US.ISO8859-1/books/handbook/jails/chapter.xml

223 ↗

(On Diff #58392)

i followed the other example already in this section.
setting the variables should not be a problem in the default shell,
i would have to research how to do the loop.

[bcr]

Looks good now, thanks! I will get this committed soon.