PreloadingDevTools: Update learn more text in UsedPreloadingView

demo: https://drive.google.com/file/d/1GQ2lpjm5bv-FUpMxYn5W_INmpTwMCHdP/view?usp=sharing

Bug: 1467878
Change-Id: I3a3c0edb852cd8a9abe0ea8cfb3a5b8f5baec514
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/4778233
Reviewed-by: Wolfgang Beyer <wolfi@chromium.org>
Commit-Queue: Huanpo Lin <robertlin@chromium.org>

front_end/panels/application/preloading/components/UsedPreloadingView.ts

diff --git a/front_end/panels/application/preloading/components/UsedPreloadingView.ts b/front_end/panels/application/preloading/components/UsedPreloadingView.ts
index 9b26fa2..c2c6ab7 100644
--- a/front_end/panels/application/preloading/components/UsedPreloadingView.ts
+++ b/front_end/panels/application/preloading/components/UsedPreloadingView.ts
@@ -68,7 +68,7 @@
   /**
    *@description Link to learn more about Preloading
    */
-  learnMore: 'Learn more',
+  learnMore: 'Learn more: Preloading on developer.chrome.com',
 };
 const str_ = i18n.i18n.registerUIStrings('panels/application/preloading/components/UsedPreloadingView.ts', UIStrings);
 const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);