documentation bug: Activity.Info fields have ambiguous type

Since:

Returns:

• Lang.Float

-----------------------------------

Note that above it's Number or Null, but at the bottom: Returns Float

The same goes for totalDescent.

averageDistance, averageSpeed, bearing: Float or Null vs Float

averageHeartRate, averagePower: Number? vs Number

etc... I stopped checking them, but it's obvious that there are 2 issues here:

1. for many fields the 2 places disagree

2. actually since we're talking about fields and not methods, I think the Returns should be removed (and of course the type of the fields need a double check)