Bug 1533372 - Update MDN link.

Differential Revision: https://phabricator.services.mozilla.com/D22805

--HG--
extra : moz-landing-system : lando

devtools/client/debugger/new/src/components/SecondaryPanes/Scopes.js

@@ -29,7 +29,8 @@ import type { NamedValue } from "../../utils/pause/scopes/types";
 
 import "./Scopes.css";
 
-const mdnLink = "https://developer.mozilla.org/en-US/docs/Tools/Debugger";
+const mdnLink =
+  "https://developer.mozilla.org/en-US/docs/Tools/Debugger/Using_the_Debugger_map_scopes_feature";
 
 const { ObjectInspector } = objectInspector;