Update jsx/LoadingBar.tsx

Co-authored-by: Maxime Mulder <maxime-mulder@outlook.com>

jsx/LoadingBar.tsx

@@ -1,7 +1,9 @@
 import React from 'react';
 
 interface LoadingBarProps {
-  progress: number; // Expect progress to be a number
+  // A number representing the progress of the progress bar, which should be
+  // between 0 and 100
+  progress: number;
 }
 
 /**