Very usefully explained Dave, thanks
As for your "Interesting fact", this is because Moodle.org has a filter which links directly to Moodle documentation via double brackets.. So for example I can type double brackets around the word wiki and it takes me straight to the documentation.... see Wiki for example.
This also has the advantage that it automatically takes you to the latest version of the documentation, currently 3.5 docs, rather than googling docs, coming up with an earlier version and having to make a manual link ro less up to date docs version. So if I wanted to send you to the latest page about Using Wiki I would do the same.