fix: error in light card button documentation

[DavidSchischke]

Additional information

• This PR fixes or closes issue: N/A
• This PR is related to issue: N(A
• Link to documentation pull request:

Checklist

• [ x] The code change is tested and works locally.
• [ x] There is no commented out code in this PR.
• [ x] I have followed the contribution guidelines
  • [x ] This PR is for a custom-card or documentation change and therefore directed to the main branch.
  • [ ] This PR is for a official card or any other directly to the integration related change and therefore directed to the release branch.