Update description in registry with minor copy edits (#9441)

Co-authored-by: Megan Moore <megan@netdata.cloud>

registry/README.md

@@ -47,7 +47,7 @@ The registry keeps track of 4 entities:
 1.  **machines**: i.e. the Netdata installations (a random GUID generated by each Netdata the first time it starts; we
     call this **machine_guid**)
 
-  For each Netdata installation (each `machine_guid`) the registry keeps track of the different URLs it is accessed.
+  For each Netdata installation (each `machine_guid`) the registry keeps track of the different URLs it has accessed.
 
 2.  **persons**: i.e. the web browsers accessing the Netdata installations (a random GUID generated by the registry the
     first time it sees a new web browser; we call this **person_guid**)
@@ -60,7 +60,7 @@ The registry keeps track of 4 entities:
   way to find a URL is to know its **machine_guid** or have a **person_guid** it is linked to it.
 
 4.  **accounts**: i.e. the information used to sign-in via one of the available sign-in methods. Depending on the
-    method, this may include an email, an email and a profile picture.
+    method, this may include an email, or an email and a profile picture or avatar.
 
 For _persons_/_accounts_ and _machines_, the registry keeps links to _URLs_, each link with 2 timestamps (first time
 seen, last time seen) and a counter (number of times it has been seen). *machines_, _persons_ and timestamps are stored