Update part1c.md

add highlight-line on definition of bornYear, props.age was replaced by age but it isn´t highlighted.

Author: lbagnascom

src/content/1/en/part1c.md

@@ -90,7 +90,7 @@ const Hello = (props) => {
   const age = props.age
   // highlight-end
 
-  const bornYear = () => new Date().getFullYear() - age
+  const bornYear = () => new Date().getFullYear() - age // highlight-line
 
   return (
     <div>