[strings] Surrogate pairs S example

Author: aruseni

1-js/05-data-types/03-string/article.md

@@ -631,10 +631,12 @@ This provides great flexibility, but also an interesting problem: two characters
 For instance:
 
 ```js run
-alert( 'S\u0307\u0323' ); // Ṩ, S + dot above + dot below
-alert( 'S\u0323\u0307' ); // Ṩ, S + dot below + dot above
+let s1 = 'S\u0307\u0323'; // Ṩ, S + dot above + dot below
+let s2 = 'S\u0323\u0307'; // Ṩ, S + dot below + dot above
 
-alert( 'S\u0307\u0323' == 'S\u0323\u0307' ); // false, different characters (?!)
+alert( `s1: ${s1}, s2: ${s2}` );
+
+alert( s1 == s2 ); // false though the characters look identical (?!)
 ```
 
 To solve this, there exists a "unicode normalization" algorithm that brings each string to the single "normal" form.