a few more small repairs

Author: TerryGLee

docs/designers/toc.yml

@@ -138,7 +138,7 @@
           href: ../ide/tutorial-2-create-a-timed-math-quiz.md
         - name: "Step 1: Create a project and add labels to your form"
           href: ../ide/step-1-create-a-project-and-add-labels-to-your-form.md
-        - name: "Step 2: Create a random addition Problem"
+        - name: "Step 2: Create a random addition problem"
           href: ../ide/step-2-create-a-random-addition-problem.md
         - name: "Step 3: Add a countdown timer"
           href: ../ide/step-3-add-a-countdown-timer.md