Remove trailing backslash

Author: MaggieKimani1

src/Microsoft.OpenApi/Services/OpenApiFilterService.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
 using System;
@@ -356,7 +356,7 @@ private static string FormatUrlString(string url, IList<OpenApiServer> serverLis
             var queryPath = string.Empty;
             foreach (var server in serverList)
             {
-                var serverUrl = server.Url;
+                var serverUrl = server.Url.TrimEnd('/');
                 if (!url.Contains(serverUrl))
                 {
                     continue;