Remove two remaining TOC items . . .

Author: fbsolo-ms1

articles/machine-learning/toc.yml

@@ -62,12 +62,8 @@
 - name: Quickstart
   expanded: true
   items:
-    - name: "Apache Spark - Environment Configuration"
-      href: apache-spark-environment-configuration.md
     - name: Create ML resources to get started
       href: quickstart-create-resources.md
-    - name: "Quickstart: Submit Apache Spark jobs in Azure Machine Learning (preview)"
-      href: quickstart-spark-jobs.md
     - name: Run Jupyter notebooks
       href: quickstart-run-notebooks.md
 - name: Tutorials