Update of ED report from new reffy run

Using reffy commit 17.2.5.

Author: reffy-bot

ed/headings/av1-avif.json

@@ -70,12 +70,19 @@
       "title": "Image Spatial Extents Property",
       "number": "2.2.2"
     },
+    {
+      "id": "clean-aperture-property",
+      "href": "https://aomediacodec.github.io/av1-avif/#clean-aperture-property",
+      "level": 4,
+      "title": "Clean Aperture Property",
+      "number": "2.2.3"
+    },
     {
       "id": "other-item-property",
       "href": "https://aomediacodec.github.io/av1-avif/#other-item-property",
       "level": 4,
       "title": "Other Item Properties",
-      "number": "2.2.3"
+      "number": "2.2.4"
     },
     {
       "id": "layered-items",