Update MediaBrowser.Controller/Entities/PersonInfo.cs

Co-Authored-By: dkanada <dkanada@users.noreply.github.com>

MediaBrowser.Controller/Entities/PersonInfo.cs

@@ -6,7 +6,7 @@ using MediaBrowser.Model.Entities;
 namespace MediaBrowser.Controller.Entities
 {
     /// <summary>
-    /// This is the small Person stub that is attached to BaseItems
+    /// This is a small Person stub that is attached to BaseItems.
     /// </summary>
     public sealed class PersonInfo : IHasProviderIds
     {