Typo in:

The ActorDefinition Resource an actor that can plays the role of a participant in some kind of described process. Generally, in the scope of FHIR, the process is some kind of data exchange, and ActorDefinition is defined for this purpose.

replace with:

The ActorDefinition Resource represents an actor that can play the role of a participant in some kind of described process. Generally, in the scope of FHIR, the process is some kind of data exchange, and ActorDefinition is defined for this purpose.