Update TOC

Author: craigshoemaker

articles/azure-functions/TOC.yml

@@ -327,7 +327,15 @@
   - name: Triggers and bindings
     items:
     - name: Blob storage
-      href: functions-bindings-storage-blob.md
+      items:
+        - name: Overview
+          href: functions-bindings-storage-blob.md
+        - name: Trigger
+          href: functions-bindings-storage-blob-trigger.md
+        - name: Input
+          href: functions-bindings-storage-blob-input.md
+        - name: Output
+          href: functions-bindings-storage-blob-output.md
     - name: Azure Cosmos DB
       items: 
       - name: Functions 1.x