build: auto-fix whitespace in docs in pre-commit hook (#17490)

docs/tutorial/in-app-purchases.md

@@ -118,4 +118,4 @@ inAppPurchase.getProducts(PRODUCT_IDS).then(products => {
     console.log('The payment has been added to the payment queue.')
   })
 })
-```
+```

docs/tutorial/linux-desktop-actions.md

@@ -38,4 +38,4 @@ parameters. You can find these in your app in the global variable
 
 [unity-launcher]: https://help.ubuntu.com/community/UnityLaunchersAndDesktopFiles#Adding_shortcuts_to_a_launcher
 [audacious-launcher]: https://help.ubuntu.com/community/UnityLaunchersAndDesktopFiles?action=AttachFile&do=get&target=shortcuts.png
-[spec]: https://specifications.freedesktop.org/desktop-entry-spec/1.1/ar01s11.html
+[spec]: https://specifications.freedesktop.org/desktop-entry-spec/1.1/ar01s11.html

docs/tutorial/updates.md

@@ -149,4 +149,4 @@ autoUpdater.on('error', message => {
 [electron-release-server]: https://github.com/ArekSredzki/electron-release-server
 [nucleus]: https://github.com/atlassian/nucleus
 [update.electronjs.org]: https://github.com/electron/update.electronjs.org
-[update-electron-app]: https://github.com/electron/update-electron-app
+[update-electron-app]: https://github.com/electron/update-electron-app