Update tutorial-3-preload.md - console log output location

[YapWC]

Description of Change

For beginners who might not know where the output is logged, it would be important to inform.

Checklist

Release Notes

Notes: No notes

[welcome[bot]]

💖 Thanks for opening this pull request! 💖

Semantic PR titles

We use semantic commit messages to streamline the release process. Before your pull request can be merged, you should update your pull request title to start with a semantic prefix.

Examples of commit messages with semantic prefixes:

• fix: don't overwrite prevent_default if default wasn't prevented
• feat: add app.isPackaged() method
• docs: app.isDefaultProtocolClient is now available on Linux

Commit signing

This repo enforces commit signatures for all incoming PRs. To sign your commits, see GitHub's documentation on Telling Git about your signing key.

PR tips

Things that will help get your PR across the finish line:

• Follow the JavaScript, C++, and Python coding style.
• Run npm run lint locally to catch formatting errors earlier.
• Document any user-facing changes you've made following the documentation styleguide.
• Include tests when adding/changing behavior.
• Include screenshots and animated GIFs whenever possible.

We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.