[net] docs: Update info in bug-triage-labels.md about Blink networking APIs

net/docs/bug-triage-labels.md

 # Chrome Network Bug Triage : Labels
 
 ## Some network label caveats
 
 **Cr-UI-Browser-Downloads**
 : Despite the name, this covers all issues related to downloading a file except
   saving entire pages (which is **Cr-Blink-SavePage**), not just UI issues.
   Most downloads bugs will have the word "download" or "save as" in the
   description.  Issues with the HTTP server for the Chrome binaries are not
   downloads bugs.
@@ skipping 52 matching lines @@
 **Cr-Blink-Loader**
 : Cross origin issues are sometimes loader related.  Blink also has an
   in-memory cache, and when it's used, requests don't appear in
   about:net-internals.  Requests for the same URL are also often merged there
   as well.  This does *not* cover issues with content/browser/loader/ files.
 
 **Cr-Blink-ServiceWorker**
 
 **Cr-Blink-Storage-AppCache**
 
-**Cr-Blink-WebSockets**
+**Cr-Blink-Network-WebSockets**
+: Issues with the WebSockets.  Attach this label to any issue about the
+  WebSocket feature regardless of where the cause of the issue is (net/ or
+  Blink).
 
-**Cr-Blink-XHR**
-: Generic issues with sync/async XHR requests - missing request or response
+**Cr-Blink-Network-FetchAPI**
+: Generic issues with the Fetch API - missing request or response
   headers, multiple headers, etc.  These will often run into issues in certain
   corner cases (Cross origin / CORS, proxy, whatever).  Attach all labels that
   seem appropriate.
 
+**Cr-Blink-Network-XHR**
+: Generic issues with sync/async XHR requests.
+
 **Cr-Services-Sync**
 : Sharing data/tabs/history/passwords/etc between machines not working.
 
 **Cr-Services-Chromoting**
 
 **Cr-Platform-Extensions**
 : Issues extensions loading / not loading / hanging.
 
 **Cr-Platform-Extensions-API**
 : Issues with network related extension APIs should have this label.
@@ skipping 34 matching lines @@
 **Cr-Privacy**
 : Privacy related bug (History, cookies discoverable by an entity that
   shouldn't be able to do so, incognito state being saved in memory or on disk
   beyond the lifetime of incognito tabs, etc).  Generally used in conjunction
   with other labels.
 
 **Type-Bug-Security**
 : Security related bug (Allows for code execution from remote site, allows
   crossing security boundaries, unchecked array bounds,
   etc).