Update README.md for Custom Chip Group Counter

[ddewar]

Looks like there was a mismatch between examples and template file fir the Custom Chip Group Counter.

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• 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.