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.

[DavidSchischke]

Hi there, I just spent 20 minutes figuring out why my "ulm_card_light_brightness_med" configuration would not work and always default to 50%. Looking at the Template code, it is clear that this should be medium instead of med, which is only displayed wrongly in the documentation.

I fixed this in the table and touched nothing else in the hopes of saving others a few minutes of headaches., Sorry if this is not up to your quality standards, I'm not a seasoned Open Source contributor (yet). Cheers!

[DavidSchischke]

Also, it looks like something with the pipelines is off. Local pre-commit hooks ran without errors, the Code Quality tests here fail due to some card I have not touched.