Re-order revision 3 members and add explanatory comments

We've come to realize that even though it's tempting to group similar
properties together, organizing the API so that revisions are grouped
together makes future maintenance more pleasant. It's a lot easier to
to see what was added and when.

The same was done for earlier revisions in 5.9 in commit 430fe83.

Change-Id: I738d7fdadd348c21737228c37d0f31e39b37f8e7
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>

0 files changed, 0 insertions, 0 deletions