Add expected type ItemList in some common cases #1833
Description
There are a few places where we ought to explicitly say "this property can have itemlist values".
- acceptedAnswer (some sites support several)
- suggestedAnswer
step (on HowTo)? not needed since HowTo is a subclassof ItemList and ListItem...- http://webschemas.org/HowToSection should be a ListItem as well as an ItemList.
http://schema.org/mainEntity ? not needed since it expects Thing