Add missing punctuation in xml comment

Co-Authored-By: Bond-009 <bond.009@outlook.com>

MediaBrowser.Controller/Authentication/AuthenticationException.cs

@@ -25,7 +25,7 @@ namespace MediaBrowser.Controller.Authentication
         /// <summary>
         /// Initializes a new instance of the <see cref="AuthenticationException"/> class.
         /// </summary>
-        /// <param name="message">The message that describes the error</param>
+        /// <param name="message">The message that describes the error.</param>
         /// <param name="innerException">The exception that is the cause of the current exception, or a null reference if no inner exception is specified.</param>
         public AuthenticationException(string message, Exception innerException)
             : base(message, innerException)