Update of TR report from new reffy run

Using reffy commit 18.7.3.

Author: reffy-bot

tr/index.json

@@ -1,7 +1,7 @@
 {
   "type": "crawl",
   "title": "Reffy crawl",
-  "date": "2025-06-01T01:37:05.040Z",
+  "date": "2025-06-02T01:36:39.120Z",
   "options": {
     "fallback": "tr/index.json",
     "output": "report",
@@ -706,7 +706,7 @@
   },
   "stats": {
     "crawled": 367,
-    "errors": 1
+    "errors": 0
   },
   "crawler": "reffy-18.7.3",
   "results": [
@@ -754,7 +754,7 @@
         "https://aomediacodec.github.io/av1-spec/"
       ],
       "crawled": "https://aomediacodec.github.io/av1-spec/av1-spec.pdf",
-      "date": "1 June 2025",
+      "date": "2 June 2025",
       "links": "links/av1-spec.json",
       "cddl": []
     },
@@ -23183,8 +23183,7 @@
       "dfns": "dfns/webrtc-svc.json",
       "headings": "headings/webrtc-svc.json",
       "ids": "ids/webrtc-svc.json",
-      "cddl": [],
-      "error": "Error: Loading https://www.w3.org/TR/webrtc-svc/ triggered HTTP status 520\n    at processSpecification (file:///home/runner/work/webref/webref/node_modules/reffy/src/lib/util.js:486:19)\n    at async crawlSpec (file:///home/runner/work/webref/webref/node_modules/reffy/src/lib/specs-crawler.js:109:22)\n    at async processSpec (file:///home/runner/work/webref/webref/node_modules/reffy/src/lib/specs-crawler.js:452:22)\n    at async ThrottledQueue.runThrottled (file:///home/runner/work/webref/webref/node_modules/reffy/src/lib/throttled-queue.js:78:22)\n    at async Promise.all (index 350)\n    at async crawlList (file:///home/runner/work/webref/webref/node_modules/reffy/src/lib/specs-crawler.js:473:21)"
+      "cddl": []
     },
     {
       "url": "https://www.w3.org/TR/webrtc/",