Update comments in release/Makefile.inc.docports to reflect the
cvs->svn conversion over a year ago.

This is a direct commit to stable/9, as this file does not exist
in higher branches.

Sponsored by:	The FreeBSD Foundation
Fix comment.

Sponsored by:	The FreeBSD Foundation
Remove evaluation of OSVERSION < 500000.
I hope to never have to build a release from a stable/5 machine.

While here, remove hard-coded lang/perl5.10, which is better
evaluated during compile-time (especially since lang/perl5.10 does
not exist in the ports/ tree).

This is a direct commit to stable/9, as this file does not exist in
higher branches.

Sponsored by:	The FreeBSD Foundation
Regenerate MINIMALDOCPORTS after the doc/ toolchain update to
docbook 5.0.

This is a direct commit to stable/9, as this file does not exist
in higher branches.

(Although, I do not think that this variable is actually used
now, since we check out the full doc/ tree from svn.)

Sponsored by:	 The FreeBSD Foundation