Fixing build errors and adding placeholders

Author: jmatthiesen

docs/ai/toc.yml

@@ -59,6 +59,18 @@ items:
     href: get-started-app-chat-template.md
   - name: Implement RAG using vector search
     href: tutorials/tutorial-ai-vector-search.md
+  - name: Loading CSV files
+    href: placeholder.md
+  - name: Loading HTML
+    href: placeholder.md
+  - name: Loading JSON
+    href: placeholder.md
+  - name: Loading Office Documents
+    href: placeholder.md
+  - name: Loading PDFs
+    href: placeholder.md
+  - name: Loading SQL Data
+    href: placeholder.md
 - name: Security & Safety
   items:
   - name: Authenticate App Service to Azure OpenAI
@@ -67,7 +79,7 @@ items:
     href: how-to/app-service-db-auth.md
   - name: Work with content filtering
     href: how-to/content-filtering.md
-- names: Testing & Evaluation
+- name: Testing & Evaluation
   items:
   - name: Evaluate LLM prompt completions
     href: tutorials/llm-eval.md
@@ -83,4 +95,3 @@ items:
     href: get-started-app-chat-scaling-with-azure-container-apps.md
 - name: Training
   items:
--