OffScreen - Add xml doc comment to constructor

Add note about legacy binding and creating the browser

Author: amaitland

CefSharp.OffScreen/ChromiumWebBrowser.cs

@@ -268,7 +268,8 @@ public class ChromiumWebBrowser : IRenderWebBrowser
         public bool CanExecuteJavascriptInMainFrame { get; private set; }
 
         /// <summary>
-        /// Create a new OffScreen Chromium Browser
+        /// Create a new OffScreen Chromium Browser. If you use <see cref="CefSharpSettings.LegacyJavascriptBindingEnabled"/> = true then you must
+        /// set <paramref name="automaticallyCreateBrowser"/> to false and call <see cref="CreateBrowser"/> after the objects are registered.
         /// </summary>
         /// <param name="address">Initial address (url) to load</param>
         /// <param name="browserSettings">The browser settings to use. If null, the default settings are used.</param>
@@ -375,7 +376,6 @@ protected virtual void Dispose(bool disposing)
         /// </summary>
         /// <param name="windowHandle">Window handle if any, IntPtr.Zero is the default</param>
         /// <exception cref="System.Exception">An instance of the underlying offscreen browser has already been created, this method can only be called once.</exception>
-
         public void CreateBrowser(IntPtr windowHandle)
         {
             if (browserCreated)