Re Moodle 1.5.3 information is getting heavy changes and mixes with the 1.6 in MoodleDocs. I agree and it makes for akward writing.
I have only used Moodle from 1.5.3 onward and now am working all the time in my 1.6 localhost, dowloading the Moodle Beta package almost every day. In the Lesson area of MoodleDocs, there is/was a lot of pre 1.5.3 legacy language and concepts. Rather than wait for 1.6 stable, I have been trying to gently edit to something of a 1.5.3 standard.
What happened when Moodle went from 1.4 to 1.5 ? Come to think of it, was MoodleDocs around then.
In a slightly related subject (and a subject of another post), we have similar issues with help files. Writing, even editing help files is a major amount of work. I suggested some sort of MoodleDocs file schema that was ..\16\lang\en\help\lesson or ..\15\lang\en\help\lesson. This gives person responsible for updating help files (Moodle module developer or Moodle site administrator) an additional resource besides a legacy version or a bug report to start with.
And how about our Moodle Demo crossover? Now I definately have gone off topic.