Currently the AssociatedFeature description reads:

This resource and referenced child resources contain information about a associated feature observations

"observations" should be singular and "a" should be "an"

It's also not clear what "referenced child resources" means. This profile doesn't reference any child resources that I can see unless this is refering to the .hasMember resources in which case replacing "referenced child resources" with "referenced .hasMember resources" would be clearer. This change (if made) should be applied to a number of other resources as well.