fix(curriculum): add missing code tag (freeCodeCamp#47119)

Author: sidemt

curriculum/challenges/english/14-responsive-web-design-22/learn-the-css-box-model-by-building-a-rothko-painting/60a3e3396c7b40068ad6998d.md

@@ -33,7 +33,7 @@ const oneFilter = getComputedStyle(one).filter;
 assert(oneFilter === 'blur(1px)');
 ```
 
-Your `.two` element should have a filter value of `blur(1px)`.
+Your `.two` element should have a `filter` value of `blur(1px)`.
 
 ```js
 const two = document.querySelector('.two');