Enhance template string lesson with newline escape sequence demonstration (#2776)

* Update introduction.md

* Update instructions.md

* Update concepts/template-strings/introduction.md

Co-authored-by: Derk-Jan Karrenbeld <[email protected]>

* [CI] Format code

---------

Co-authored-by: Derk-Jan Karrenbeld <[email protected]>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: 3 people

concepts/template-strings/introduction.md

@@ -32,8 +32,22 @@ When you are needing to have strings formatted on multiple lines:
 `This is an example of using template
 strings to accomplish multiple
 lines`;
+
+/* => This is an example of using template
+     strings to accomplish multiple
+     lines
+*/
 ```
 
+If you want to represent a newline inside a regular string instead of using a template string (ie. not using backticks), you can use the newline escape sequence `\n`:
+
+````javascript
+"This is an example of using the newline escape sequence!\nWithout backticks"
+
+/* => This is an example of using the newline escape sequence!
+      Without backticks
+*/
+
 With the available substitution capabilities, you can also introduce logic into the process to determine what the output string should be.
 One way to handle the logic could be using the [ternary operator][ternary-operator].
 This gives the same conditional `if/else` functionality in a slightly different format.
@@ -45,7 +59,7 @@ const grade = 95;
 
 `You have ${grade > 90 ? 'passed' : 'failed'} the exam.`;
 // => You have passed the exam.
-```
+````
 
 [string-reference]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String
 [type-conversion-concept]: /tracks/javascript/concepts/type-conversion

exercises/concept/custom-signs/.docs/instructions.md

@@ -32,7 +32,9 @@ Implement the function `graduationFor(name, year)` which takes a name as a strin
 
 ```javascript
 graduationFor('Hannah', 2022);
-// => "Congratulations Hannah!\nClass of 2022"
+/* => "Congratulations Hannah!
+       Class of 2022"
+*/
 ```
 
 ## 4. Compute the cost of a sign