fix(learn): Correct syntax in the code example (#40811)

Closes #40810

curriculum/challenges/english/06-quality-assurance/quality-assurance-and-testing-with-chai/test-for-truthiness.md

@@ -14,7 +14,7 @@ As a reminder, this project is being built upon the following starter project on
 
 ```js
 assert.isTrue(true, 'this will pass with the boolean value true');
-assert.isTrue('true', 'this will NOT pass with the string value 'true');
+assert.isTrue('true', 'this will NOT pass with the string value "true"');
 assert.isTrue(1, 'this will NOT pass with the number value 1');
 ```