Update README for test

Author: parlough

webdev/README.md

@@ -49,7 +49,8 @@ Usage: webdev serve [arguments] [<directory>[:<port>]]...
                                            + D / Option + D). This also enables
                                            --launch-in-chrome.
     --[no-]debug-extension                 Enable the backend for the Dart Debug
-                                           Extension.
+                                           Extension. Learn more at
+                                           dart.dev/to/web-debug-extension.
     --[no-]injected-client                 Whether or not to inject the
                                            client.js script in web apps. This is
                                            required for all debugging related

webdev/lib/src/command/serve_command.dart

@@ -36,7 +36,7 @@ refresh: Performs a full page refresh.
             'This also enables --$launchInChromeFlag.')
     ..addFlag(debugExtensionFlag,
         help: 'Enable the backend for the Dart Debug Extension. '
-            'Learn more at https://dart.dev/to/web-debug-extension.')
+            'Learn more at dart.dev/to/web-debug-extension.')
     ..addFlag(enableInjectedClientFlag,
         help: 'Whether or not to inject the client.js script in web apps. This '
             'is required for all debugging related features, but may interact '