Fix reference link for [TIMING] (#646)

Author: antosart

index.bs

@@ -183,10 +183,9 @@ spec: WebRTC; urlPrefix: https://www.w3.org/TR/webrtc/
     "authors": [ "Ilya Gregorik", "Mike West" ]
   },
   "TIMING": {
-      "href": "https://www.contextis.com/media/downloads/Pixel_Perfect_Timing_Attacks_with_HTML5_Whitepaper.pdf",
-      "title": "Pixel Perfect Timing Attacks with HTML5",
-      "authors": [ "Paul Stone" ],
-      "publisher": "Context Information Security"
+      "href": "https://owasp.org/www-pdf-archive/HackPra_Allstars-Browser_Timing_Attacks_-_Paul_Stone.pdf",
+      "title": "Pixel Perfect Timing Attacks",
+      "authors": [ "Paul Stone" ]
   },
   "H5SC3": {
       "href": "https://github.com/cure53/XSSChallengeWiki/wiki/H5SC-Minichallenge-3:-%22Sh*t,-it%27s-CSP!%22",