fix(curriculum): update string method lesson to include variable usage example (#66229)

curriculum/challenges/english/blocks/lecture-working-with-string-modification-methods/67326c3392068ec6184a0c95.md

@@ -75,6 +75,21 @@ The `repeat()` method can simplify tasks that involve string duplication, making
 
 Whether you're generating repeated text patterns or filling a space with characters, `repeat()` can save you from writing loops or more complex code.
 
+You are not limited to passing a number directly into the `repeat()` method. You can also pass a variable that stores a number value.
+
+:::interactive_editor
+
+```js
+let count = 4;
+let word = "Test";
+let repeatedWord = word.repeat(count);
+console.log(repeatedWord); // TestTestTestTest
+```
+
+:::
+
+In this example, the `count` variable stores the number of repetitions. This can be useful when the number of repetitions depends on user input or other dynamic values in your program.
+
 # --questions--
 
 ## --text--