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[strings] Surrogate pairs S example

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Original file line number	Diff line number	Diff line change
`@@ -631,10 +631,12 @@ This provides great flexibility, but also an interesting problem: two characters`
`631`	`631`	`For instance:`
`632`	`632`
`633`	`633`	```js run
`634`		`-alert( 'S\u0307\u0323' ); // Ṩ, S + dot above + dot below`
`635`		`-alert( 'S\u0323\u0307' ); // Ṩ, S + dot below + dot above`
	`634`	`+let s1 ='S\u0307\u0323'; // Ṩ, S + dot above + dot below`
	`635`	`+let s2 ='S\u0323\u0307'; // Ṩ, S + dot below + dot above`
`636`	`636`
`637`		`-alert( 'S\u0307\u0323' == 'S\u0323\u0307' ); // false, different characters (?!)`
	`637`	+alert( `s1: ${s1}, s2: ${s2}` );
	`638`	`+`
	`639`	`+alert( s1 == s2 ); // false though the characters look identical (?!)`
`638`	`640`	```
`639`	`641`
`640`	`642`	`To solve this, there exists a "unicode normalization" algorithm that brings each string to the single "normal" form.`

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