Back out last change to sysctl.

Back out last change to sysctl.

It was nay'ed before committing on the grounds that this is not
the way to do it, and has been decided as such several times in
the past.

There is not point in loading gobs of ascii into the kernel when
the only use of that ascii is presentation to the user.

Next thing we'd be adding all section 4 man pages to the loaded
kernel as well.

The argument about KLD's is bogus, klds can store a file in
/usr/share/doc/sysctl/dev/foo/thisvar.txt with a description and
sysctl or other facilities can pick it up there.

Proper documentation will take several K worth of text for many
sysctl variables, we don't want that in the kernel under any
circumstances.

I will welcome any well thought out attempt at improving the
situation wrt. sysctl documentation, but this wasn't it.