comment on sw-oosd-primer

I just read A Semantic Web Primer for Object-Oriented Software Developers
[1].  Thanks for providing it.

As I was reading, I found several typos.  Attached is a suggested update
along with a set of diffs.

	Mike

[1] http://www.w3.org/TR/2006/NOTE-sw-oosd-primer-20060309/