Aggregation documentation does not match actual interface menu

Petr, can you please make sure that the Aggregation help file:

http://test.moodle.com/help.php?module=grade&file=aggregation.html

exactly matches the menu:

Mean of grades
Median of grades
Lowest grade
Highest grade
Mode of grades
Weighted mean of grades
Simple weighted mean of grades
Mean of grades (with extra credits)
Sum of grades

All the stuff about "non-empty" can go I think since it's a separate option. And some simple maths like (A + B + C) / 3 couldn't hurt.

By the way, the order of this menu should also be rationalised first (put the means together, for example)