Fix docs_test. I just learned that when updating docs under html we also need to

tools/dom/docs/docs.json

Index: tools/dom/docs/docs.json
diff --git a/tools/dom/docs/docs.json b/tools/dom/docs/docs.json
index ba4c2b3279eeb9b1807ef4e448478dd31dd59abc..3b71d3c5f6e4c900eb43915fece1c755c6fef2bd 100644
--- a/tools/dom/docs/docs.json
+++ b/tools/dom/docs/docs.json
@@ -188,10 +188,11 @@
     "HTMLDivElement": {
       "comment": [
         "/**",
-        " * Represents an HTML <div> element.",
+        " * A generic container for content on an HTML page;",
+        " * corresponds to the &lt;div&gt; tag.",
         " *",
-        " * The [DivElement] is a generic container for content and does not have any",
-        " * special significance. It is functionally similar to [SpanElement].",
+        " * The [DivElement] is a generic container and does not have any semantic",
+        " * significance. It is functionally similar to [SpanElement].",
         " *",
         " * The [DivElement] is a block-level element, as opposed to [SpanElement],",
         " * which is an inline-level element.",
@@ -479,6 +480,16 @@
       }
     }
   },
+  "dart.dom.indexed_db": {
+    "IDBDatabase": {
+      "comment": [
+        "/**",
+        " * An indexed database object for storing client-side data",
+        " * in web apps.",
+        " */"
+      ]
+    }
+  },
   "dart.dom.web_audio": {
     "ScriptProcessorNode": {
       "members": {