Update selectors.md

[skillsnate]

Added a component example, with a template, to make it clear how the selectors can work

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:
• Documentation modification

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the dev branch.
• 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

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

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[skillsnate]

I have added two different ways to define the component, and I wasn't sure which one would be preferred. The main point I was trying to clarify was how the ref and name selectors can be used to select elements, with an example. Totally understand if this is too different to other testing documentation and not needed. While I'm getting more into the vue testing space, I found a bit of confusion here and thought an example would help 👍

[skillsnate]

The failed CI test looks to be related to code styling, for 7 pages, One of them I have modified. Pulling the docker image and running the prettier to determine what's wrong with the styling to fix it

[skillsnate]

Unfortunately I can't find the project files in the docker image, I suspect they're added as part of the implementation details in CircleCI's 'attaching workspace' step. I haven't setup this project locally, just changed the file in github's editor. If it's needed I can set it up locally, but I don't want to spend more time on this, unless someone from vuejs can let me know if it's worth it.

So I guess, bump