Removed "/" from line .. ServerRelativeUrl (SharePoint#6370)

I have used the code in the section for "Add a sub-folder to a folder (.net)" but got "Server relative urls must start with SPWeb.ServerRelativeUrl" Exception.
I changed the URL and removed the / at the beginning, and the code worked well.

Author: hohenp

docs/solution-guidance/supporting-and-in-file-and-folder-with-the-resourcepath-api.md

@@ -140,11 +140,11 @@ The following C# properties are added to return System.Uri with unambiguous enco
   ClientContext context = new ClientContext("http://site");
   Web web = context.Web;
   // Get the parent folder
-  ResourcePath folderPath = ResourcePath.FromDecodedUrl("/Shared Documents");
+  ResourcePath folderPath = ResourcePath.FromDecodedUrl("Shared Documents");
   Folder parentFolder = web.GetFolderByServerRelativePath(folderPath);
 
   // Create the parameters used to add a folder
-  ResourcePath subFolderPath = ResourcePath.FromDecodedUrl("/Shared Documents/sub folder");
+  ResourcePath subFolderPath = ResourcePath.FromDecodedUrl("Shared Documents/sub folder");
   FolderCollectionAddParameters folderAddParameters = new FolderCollectionAddParameters();
   folderAddParameters.Overwrite = true;