docs update for #1578

[alexmiddeleer]

Closes #1584

The PR fulfills these requirements:

• [ X ] It's submitted to the dev branch.
• [ X ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• [ ] All tests are passing: https://github.com/vuejs/vue-test-utils/blob/dev/.github/CONTRIBUTING.md#development-setup
• [ ] New/updated tests are included

Note that prettier found some issues in:
docs/zh/guides/common-tips.md
docs/zh/guides/getting-started.md

But I did not touch these files.

[alexmiddeleer]

I attempted to fix the pre-existing prettier errors in #1581

[alexmiddeleer]

Please let me know if there's anything you're still waiting on me for.

[afontcu]

Looks good! There are some issues with Prettier. Would you mind running yarn format and push again? (I think they might be unrelated to your changes)

[alexmiddeleer]

@afontcu I ran yarn format, but it resulted in the same code changes that I addressed in #1581. Those changes broke a desired convention in the /zh language docs.

[afontcu]

Hm, weird. It def looks like it is related to zh docs. Will take a look, but otherwise your PR looks fine 👍 gonna try to find out what's going on and then merge it up.

thanks!! 🤗

[afontcu]

Closing in favor of #1611! thanks for this :)