[DevTools] Update link URL

The original URL points to an article outside of DevTools's website. This
patch updates to URL to a newly-added article section inside DevTools's
website. That article section was added by:
https://github.com/google/WebFundamentals/pull/6781

Bug: 847462
Change-Id: If93df903011a714c657ff673c01376c2a5ee78ec
Reviewed-on: https://chromium-review.googlesource.com/c/1320709Reviewed-by: Erik Luo <luoe@chromium.org>
Commit-Queue: Haihong Li (Harley) <hhli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605814}

third_party/blink/renderer/devtools/front_end/resources/ServiceWorkerCacheViews.js

@@ -360,7 +360,7 @@ Resources.ServiceWorkerCacheView.DataGridNode = class extends DataGrid.DataGridN
     } else if (columnId === 'responseType') {
       if (this._responseType === 'opaqueResponse') {
         const opaque = UI.XLink.create(
-            'https://developers.google.com/web/tools/workbox/guides/storage-quota#beware_of_opaque_responses',
+            'https://developers.google.com/web/tools/chrome-devtools/progressive-web-apps#opaque-responses',
             ls`opaque`);
         opaque.title = ls`As a security consideration, an opaque response potentially takes ` +
             ls`up far more cache space than its content length`;