Adding SpecialStatistic rules of type "simple" doesn't actually do anything

[iconmaster5326]

The documentation on SpecialStatistic rules states that there are three types of special statistic: https://github.com/foundryvtt/pf2e/wiki/Quickstart-guide-for-rule-elements#special-statistic

However, the simple type of special statistic doesn't actually do anything. As Tikael on Discord discovered, the code for computing simple special statistics just returns before crunching any numbers:

This is less than helpful when, for example, calling getStatistic on an actor and finding that it always returns null. It would be great if simple SpecialStatistics were properly supported by the system.

[TikaelSol]

Removed the wiki reference to it, not sure what the ideal way to go about making a non-check statistic is, like a new speed or other value.