docs: complete XML documentation for all projects with inheritdoc tags

Co-authored-by: andrew-welker <1765622+andrew-welker@users.noreply.github.com>

src/PepperDash.Essentials.Core/Routing/IInputSync.cs

@@ -7,6 +7,9 @@ using System.Threading.Tasks;
 
 namespace PepperDash.Essentials.Core.Routing
 {
+    /// <summary>
+    /// Defines the contract for IVideoSync
+    /// </summary>
     public interface IVideoSync : IKeyed
     {
         bool VideoSyncDetected { get; }