fix toc

Author: diberry

articles/cognitive-services/QnAMaker/toc.yml

@@ -55,14 +55,8 @@
       - name: Python
         href: Quickstarts/get-answer-from-knowledge-base-python.md
 
-  - name: Using SDKs
-    items:
-    - name: C#
-      href: ./Quickstarts/create-publish-kb-csharp-sdk.md
-    - name: Node.js
-      href: ./Quickstarts/create-publish-kb-nodejs-sdk.md
-    - name: Python
-      href: ./Quickstarts/python-sdk.md
+  - name: Using SDK
+    href: ./Quickstarts/quickstart-sdk.md
 - name: Tutorials
   items:
   - name: Create and answer from KB