Improve deprecated message on webPreferences options

lib/browser/api/browser-window.js

@@ -280,7 +280,7 @@ const checkForDeprecatedOptions = function(options) {
   }
   if (webPreferenceOption) {
     try {
-      deprecate.log(`Setting ${webPreferenceOption} on options is deprecated. Set it on options.webPreferences instead.`);
+      deprecate.log(`options.${webPreferenceOption} is deprecated. Use options.webPreferences.${webPreferenceOption} instead.`);
     } catch (error) {
       // Return error message so it can be rethrown via C++
       return error.message;

spec/api-browser-window-spec.js

@@ -776,7 +776,7 @@ describe('browser-window module', function() {
     it('throws a deprecation error for option keys that should be set on webPreferences', function() {
       assert.throws(function () {
         new BrowserWindow({zoomFactor: 1});
-      }, 'Setting zoomFactor on options is deprecated. Set it on options.webPreferences instead.');
+      }, 'options.zoomFactor is deprecated. Use options.webPreferences.zoomFactor instead.');
     });
   });
 });