Clarify how entity is used in Overview, connect to DID subject; fixes #…

…117

index.html

@@ -221,13 +221,14 @@ <h2>
       </p>
 
       <p>
-The entities are identified by decentralized identifiers (DIDs), and
+Entities are identified by decentralized identifiers (DIDs), and
 may authenticate via proofs (e.g., digital signatures,
 privacy-preserving biometric protocols, etc.). DIDs point to DID
 Documents. A DID Document contains a set of service endpoints for
-interacting with the entity. Following the dictums of
+interacting with the entity the DID identifies (aka the DID subject).
+Following the dictums of
 <a href="https://en.wikipedia.org/wiki/Privacy_by_design">Privacy by
-Design</a>, each entity may have as many DIDs as necessary, to
+Design</a>, any entity may have as many DIDs as necessary, to
 respect the entity’s desired separation of identities, personas, and
 contexts.
       </p>