Outdated references to Apple Darwin and Mac OS X (Server) in section 4.4 of Explaining BSD

[Graham Perrin]

At
<https://www.freebsd.org/doc/en_US.ISO8859-1/articles/explaining-bsd/comparing-bsd-and-linux.html>
under
4.4. What versions of BSD are available?

The phrase '/Mac OS//® X' appears three times. The first can/should
change to '/OS X®'. Second and subsequent appearances on the same page
need not bear the ®.

The second appearance refers to <*http://www.apple.com/macosx/server/*>
which was not a home page for Mac OS X, and is not a home for OS X.
Instead, for OS X please use:

<http://www.apple.com/osx/>

The word 'Darwin' appears twice. The first refers to
<http://developer.apple.com/darwin/>, which redirects to
<https://developer.apple.com/opensource/> with no mention of Darwin.

<http://web.archive.org/web/20080705164305/http://developer.apple.com/Darwin>
suggests that the Darwin-specific URL was last used by Apple some time
in 2008.

At <http://opensource.apple.com/> Apple uses the phrase 'Darwin
Technologies' to refer to
<https://developer.apple.com/library/mac/#documentation/MacOSX/Conceptual/OSX_Technology_Overview/SystemTechnology/SystemTechnology.html>.
That page begins with 'Kernel and Device Drivers Layer', which puts BSD
in context (the word Darwin appears later).

At
<http://www.apple.com/legal/intellectual-property/trademark/appletmlist.html>

Mac OS X is not listed as a trademark, but that list is non-exhaustive.

OS X® is listed.