Bug 1721825 - [devtools] Updated 'Learn more' link in the new Performance panel r=jdescottes,julienw.

Differential Revision: https://phabricator.services.mozilla.com/D122572

devtools/client/performance-new/components/OnboardingMessage.js

@@ -35,8 +35,7 @@ const Localized = createFactory(
 const Services = require("Services");
 const { openDocLink } = require("devtools/client/shared/link");
 
-const LEARN_MORE_URL =
-  "https://developer.mozilla.org/docs/Mozilla/Performance/Profiling_with_the_Built-in_Profiler";
+const LEARN_MORE_URL = "https://profiler.firefox.com/docs";
 const ONBOARDING_PREF = "devtools.performance.new-panel-onboarding";
 
 /**