fix: update A/B testing links for consistency

Author: NKeleher

_quarto.yml

@@ -126,9 +126,9 @@ website:
               - text: "About A/B Testing"
                 href: ./monitoring-evaluation-learning/ab-testing/index.qmd
               - text: "When A/B Testing Works"
-                href: ./monitoring-evaluation-learning/ab-testing/when-ab-testing-works.qmd
+                href: ./monitoring-evaluation-learning/ab-testing/when-ab-tests-works.qmd
               - text: "Implementing A/B Testing"
-                href: ./monitoring-evaluation-learning/ab-testing/implementing-ab-testing.qmd
+                href: ./monitoring-evaluation-learning/ab-testing/implementing-ab-tests.qmd
               - text: "Learning Roadmap Guide"
                 href: ./monitoring-evaluation-learning/ab-testing/learning-roadmap-guide.qmd
       - section: "Research Ethics"