Update observer pattern description

src/ObserverPattern/ObserverPatternExamples.cs

@@ -64,8 +64,10 @@ They simply communicate with the help of message queues.
         private static string GetActors()
         {
             return @"
-Subject -> Notifies interested observers when an event occurs
-Observer -> Registers to a subject, to be notified when a specific event happens
+Subject -> Interface/Abstract Notifies interested observers when an event occurs
+Concrete Subject -> Implementation of Subject
+Observer -> Interface/Abstract class -> Registers to a subject, to be notified when a specific event happens
+Concrete Observer -> Implementation of the observer
 ";
         }
 

src/ObserverPattern/StockUpdateEvents/StockSubject.cs

@@ -4,7 +4,7 @@ using System.Reactive.Subjects;
 namespace ObserverPattern.StockUpdateEvents
 {
     /// <summary>
-    /// Subject
+    /// Subject to be observed
     /// </summary>
     public class StockSubject
     {