Docs are generated for Mongoose

Comments in headers are changed a bit: removed adoc-specific stuff,
markdown is used instead

PUBLISHED_FROM=9242cce85cc52a47a197d377e7e23804721a6bb5

docs/design-concept/items.json

@@ -1,6 +1,9 @@
 {
   "items": [
     { "type": "markdown", "name": "intro.md" },
-    { "type": "markdown", "name": "memory-buffers.md" }
+    { "type": "markdown", "name": "memory-buffers.md" },
+    { "type": "markdown", "name": "event-handler.md" },
+    { "type": "markdown", "name": "events.md" },
+    { "type": "markdown", "name": "conn-flags.md" }
   ]
 }