Update testing_database_operations.md

nodeJS/testing_express/testing_database_operations.md

@@ -75,6 +75,6 @@ This is also not the only way to set up a testing environment! If you are using
 ### Knowledge check
 This section contains questions for you to check your understanding of this lesson. If you’re having trouble answering the questions below on your own, review the material above to find the answer.
 
-- <a class="knowledge-check-link" href="#but-do-you-even-need-to-test-that">What is the purpose of using a separate database for testing?</a>
-- <a class="knowledge-check-link" href="#mongodb-memory-server">How would you create and setup a testing database using the npm package `mongodb-memory-server`?</a>
-- <a class="knowledge-check-link" href="https://jestjs.io/docs/en/mongodb">What is an alternative method of database setup for your testing environment?</a>
+- [What is the purpose of using a separate database for testing?](#but-do-you-even-need-to-test-that)
+- [How would you create and setup a testing database using the npm package `mongodb-memory-server`?](#mongodb-memory-server)
+- [What is an alternative method of database setup for your testing environment?](https://jestjs.io/docs/en/mongodb)