Remove empty <return> doc-comments

Author: rjmholt

src/PowerShellEditorServices.Protocol/LanguageServer/ExecutionStatusChangedEvent.cs

@@ -10,7 +10,6 @@ public class ExecutionStatusChangedEvent
         /// <summary>
         /// The notification type for execution status change events in the message protocol
         /// </summary>
-        /// <returns></returns>
         public static readonly
             NotificationType<object, object> Type =
             NotificationType<object, object>.Create("powerShell/executionStatusChanged");

src/PowerShellEditorServices.Protocol/Server/LanguageServer.cs

@@ -1280,7 +1280,6 @@ await this.messageSender.SendEvent(
         /// </summary>
         /// <param name="sender">the PowerShell context sending the execution event</param>
         /// <param name="e">details of the execution status change</param>
-        /// <returns></returns>
         private async void PowerShellContext_ExecutionStatusChanged(object sender, ExecutionStatusChangedEventArgs e)
         {
             await this.messageSender.SendEvent(