Update metadata_customized_docs.json: add spec dir sturcture, api versions and branches, breaking changes deep dive; remove avocado as it is obsolete (#8029)

* Update metadata_customized_docs.json: add dir sturcture, api versions and branches, breaking changes deep dive; remove avocado as it is obsolete

* Update metadata_customized_docs.json

* Update metadata_customized_docs.json

tools/sdk-ai-bots/Embeddings/settings/metadata_customized_docs.json

@@ -47,10 +47,6 @@
     "title": "AutoRest Extensions for OpenAPI 2.0",
     "url": "https://github.com/Azure/autorest/blob/main/docs/extensions/readme.md"
   },
-  "avocado-readme.md": {
-    "title": "Avocado Readme",
-    "url": "https://github.com/Azure/avocado/blob/main/README.md"
-  },
   "control_plane_template.md": {
     "title": "Control plane pull request template",
     "url": "https://github.com/Azure/azure-rest-api-specs/blob/main/.github/PULL_REQUEST_TEMPLATE/control_plane_template.md"
@@ -58,5 +54,9 @@
   "data_plane_template.md": {
     "title": "Data plane pull request template",
     "url": "https://github.com/Azure/azure-rest-api-specs/blob/main/.github/PULL_REQUEST_TEMPLATE/data_plane_template.md"
+  },
+  "directory-structure.md": {
+    "title": "azure-rest-api-specs repos directory structure",
+    "url": "https://github.com/Azure/azure-rest-api-specs/blob/main/documentation/directory-structure.md"
   }
-}
+}