Updated 'calculating squares' code (#32357)

Added two lines breaks after finished so the next time the function is used it won't appear in the same line but in the next one.

files/en-us/learn/javascript/building_blocks/looping_code/index.md

@@ -266,7 +266,7 @@ function calculate() {
     const newResult = `${i} x ${i} = ${i * i}`;
     results.textContent += `${newResult}\n`;
   }
-  results.textContent += "\nFinished!";
+  results.textContent += "\nFinished!\n\n";
 }
 
 const calculateBtn = document.querySelector("#calculate");