fix(curriculum): replace head content regex (freeCodeCamp#55925)

Author: lasjorg

curriculum/challenges/english/14-responsive-web-design-22/learn-typography-by-building-a-nutrition-label/615f34ecc1091b4fd5a8a484.md

@@ -30,7 +30,7 @@ assert.notMatch(code, /<\/link>/);
 Your two `link` elements should be inside the `head` element.
 
 ```js
-const headContentRegex = /(?<=<head\s*>)(?:.|\s*)*?(?=<\/head\s*>)/;
+const headContentRegex = /(?<=<head\s*>)[\S|\s]*(?=<\/head\s*>)/;
 const headElementContent = code.match(headContentRegex);
 
 const headElement = document.createElement("head");