pmap_kextract(9): some additions

Mainly, provide a little more detail on the caller's responsibilities.

Suggested by: kib, jhb
Reviewed by: kib, markj
Sponsored by: The FreeBSD Foundation
Different

pmap_kextract(9): some additions

Mainly, provide a little more detail on the caller's responsibilities.

Suggested by: kib, jhb
Reviewed by: kib, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D42458

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pmap_kextract(9): tweaks

Improve the clarity of some descriptions. Fix a long line.

Suggested by: kib
Fixes: 74e4a8d208f0 ("pmap: add pmap_kextract(9) man page")

pmap: add pmap_kextract(9) man page

Add a man page for pmap_kextract(9), with alias to vtophys(9). This man
page is based on pmap_extract(9).

Add it as cross reference in pmap(9), and add comments

pmap: add pmap_kextract(9) man page

Add a man page for pmap_kextract(9), with alias to vtophys(9). This man
page is based on pmap_extract(9).

Add it as cross reference in pmap(9), and add comments above the
function implementations.

Co-authored-by: Graham Perrin <grahamperrin@gmail.com>
Co-authored-by: mhorne
Sponsored by: The FreeBSD Foundation
Pull Request: https://github.com/freebsd/freebsd-src/pull/827

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