Fix typos in comment

lib/renderer/window-setup.js

@@ -32,9 +32,9 @@ const resolveURL = function (url) {
   return a.href
 }
 
-// Use this method to ensure value expected as string in the main process
-// are convertible to string in the renderer process. This ensures exceptions
-// converting values to string are thrown in this process.
+// Use this method to ensure values expected as strings in the main process
+// are convertible to strings in the renderer process. This ensures exceptions
+// converting values to strings are thrown in this process.
 const toString = (value) => {
   return value != null ? `${value}` : value
 }