siteDefaults article does not mention new hsts tag

[martinbherbener]

The siteDefaults article https://learn.microsoft.com/en-us/iis/configuration/system.applicationhost/sites/sitedefaults/ does not mention the recent addition of the <hsts> element in the Compatibility table or in the list of Child elements, but per https://learn.microsoft.com/en-us/iis/configuration/system.applicationhost/sites/sitedefaults/hsts it is available for use starting in IIS 10.0 version 1709.