Bug 1519164 - Update content blocking UI tour url. r=nhnt11

Differential Revision: https://phabricator.services.mozilla.com/D16288

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

browser/app/profile/firefox.js

@@ -1544,7 +1544,7 @@ pref("browser.contentblocking.reportBreakage.url", "https://tracking-protection-
 
 pref("browser.contentblocking.introCount", 0);
 
-pref("privacy.trackingprotection.introURL", "https://www.mozilla.org/%LOCALE%/firefox/%VERSION%/tracking-protection/start/");
+pref("privacy.trackingprotection.introURL", "https://www.mozilla.org/%LOCALE%/firefox/%VERSION%/content-blocking/start/");
 
 // Workaround for Google Recaptcha
 pref("urlclassifier.trackingAnnotationSkipURLs", "google.com/recaptcha/,*.google.com/recaptcha/");