man: use https URLs for www.NetBSD.org

branches: 1.22.18;
Remove workaround for ancient HTML generation code.

In the EXAMPLES section, use device_t and accessors instead of struct
device.

Remove boilerplate in CODE REFERENCES on file paths.
Describe in intro(9) how to read paths in the CODE REFERENCES section.

Don't use complete prototypes in FUNCTIONS. But use standard section headers.

Three small markup improvements.

branches: 1.17.18;
Suggest #include <sys/evcnt.h> instead of <sys/device.h>, since
the former is sufficient, and the latter pulls in oodles of
unnecessary stuff.

Use TAB in .Bd -literal.

branches: 1.15.8;
"is be" -> "is"

u_intN_t -> uintN_t

Document the EVCNT_TYPE_TRAP event type.

typo: "The value NULL is be used" -> "The value NULL is used"

The source file is changed.

Use
.In header.h
instead of
.Fd #include \*[Lt]header.h\*[Gt]
Much easier to read and write, and supported by groff for ages.
Okayed by ross.

The correct capitalisation of 'NetBSD.org' is (you
guessed it) 'NetBSD.org'.

some mdoc fixes.

"Utilize" has exactly the same meaning as "use," but it is more
difficult to read and understand. Most manuals of English style
therefore say that you should use "use".

New sentence, new line.

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Sort sections.

Use standard section headers.

Change xref for vmstat(8) to vmstat(1).
Whitespace, punctuation and spelling fixes while I'm here.

branches: 1.2.4;
Replace my personal attribution string ("This product includes software
developed by Christopher G. Demetriou for the NetBSD Project.") with
a generic NetBSD one ("This product includes software developed for the
NetBSD Project. See http://www.netbsd.org/ for information about NetBSD.")
so that this same set of terms can be used by others if they so desire.
(Eventually i'll be converting more/all of my code.)

Implement the more flexiable `evcnt' interface as discussed (briefly) on
tech-kern and now documented in evcnt(9).