docs: fix typos in doc/tutorial/electron-versioning.md

[jienius]

Description of Change

Small fixes for a couple of typos I found

Checklist

• PR description included and stakeholders cc'd
• relevant documentation is changed or added
• PR title follows semantic commit guidelines(https://github.com/electron/clerk/blob/master/README.md#examples).
• This is NOT A BREAKING CHANGE. Breaking changes may not be merged to master until 11-x-y is branched.

Release Notes

Notes: none

[welcome]

💖 Thanks for opening this pull request! 💖

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• fix: don't overwrite prevent_default if default wasn't prevented
• feat: add app.isPackaged() method
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[malept]

Can you please fill out the pull request template and paste it into the pull request summary?

[jkleinsc]

Thanks for the PR @jienius!

[welcome]

Congrats on merging your first pull request! 🎉🎉🎉

[release-clerk]

No Release Notes