docs: toHaveAttribute doesn't work

[DaleSeo]

What:

Hi, I'm new to this project. While just following the README.md, I noticed that the very first example test code doesn't work.

  ✕ click (90 ms)

  ● click

    expect(element).toHaveAttribute("checked", true) // element.getAttribute("checked") === true

    Expected the element to have attribute:
      checked=true
    Received:
      null

I realized that using toBeChecked() makes the test pass.

Why:

I played around with this checkbox on the dev tools on my browser and I noticed that the checked attribute doesn't actually get added to the input element when I clicked the checkbox.

Checklist:

• Documentation
• Tests N/A
• Typings N/A
• Ready to be merged N/A

[codecov]

Codecov Report

Merging #524 (daa999a) into master (377e99c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #524   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          675       675           
  Branches       211       211           
=========================================
  Hits           675       675           

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[github-actions]

🎉 This PR is included in version 12.6.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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