WIP: Fix Korean translation's minor mistakes

[revi]

Mostly spacing error, one Markdown error.

WIP, I plan to have a look at the whole translation this weekend or later next week.

[welcome]

💖 Thanks for opening this pull request! 💖

Here is a list of things that will help get it 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.

[zeke]

Thanks for your contribution!

I wanted to let you know that we're working on a new system for translating Electron's docs. See the readme at electron/electron-i18n for info on how to get started, or you can jump right into translating at https://crowdin.com/project/electron

[zeke]

I'm happy to merge these changes, but would advise directing your energy to https://crowdin.com/project/electron instead. 🙏

[revi]

Hi, in that case just merge this and I’ll continue there!

[welcome]

Congrats on merging your first pull request! 🎉🎉🎉