TOC typo fix

Author: VesaJuvonen

docs/toc.yml

@@ -166,7 +166,7 @@
         href: design/reactive-and-nonreactive-web-parts.md
       - name: Responsive design
         href: design/grid-and-responsive-design.md
-      - name: Tities and descriptions
+      - name: Titles and descriptions
         href: design/web-part-titles-and-descriptions.md
       - name: UI text
         href: design/ui-text-for-web-parts.md