Fixes Exercises:Level 3 in 12_day_regular_expressions.md

Fixed an indentation issue that results in an unintended result.

12_Day_Regular_expressions/12_day_regular_expressions.md

@@ -496,11 +496,12 @@ distance = 12
   ```js
     sentence = `%I $am@% a %tea@cher%, &and& I lo%#ve %tea@ching%;. There $is nothing; &as& mo@re rewarding as educa@ting &and& @emp%o@wering peo@ple. ;I found tea@ching m%o@re interesting tha@n any other %jo@bs. %Do@es thi%s mo@tivate yo@u to be a tea@cher!?`
     console.log(cleanText(sentence))
-   ```
-
-   ```sh
+  ```
+  
+  ```sh
     I am a teacher and I love teaching There is nothing as more rewarding as educating and empowering people I found teaching more interesting than any other jobs Does this motivate you to be a teacher
-    ```
+  ```
+ 
 2. Write a function which find the most frequent words. After cleaning, count three most frequent words in the string.
 
   ```js