another small repair

Author: TerryGLee

docs/designers/toc.yml

@@ -123,7 +123,7 @@
           href: ../ide/step-6-name-your-button-controls.md
         - name: "Step 7: Add dialog components to your form"
           href: ../ide/step-7-add-dialog-components-to-your-form.md
-        - name: "Step 8: Write Code for the Show a Picture button event handler"
+        - name: "Step 8: Write code for the Show a Picture button event handler"
           href: ../ide/step-8-write-code-for-the-show-a-picture-button-event-handler.md
         - name: "Step 9: Review, comment, and test your code"
           href: ../ide/step-9-review-comment-and-test-your-code.md