Update action.yml with find-exec

[glenn-jocher]

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🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhancement of the Markdown formatting GitHub Action for Ultralytics repositories.

📊 Key Changes

• The action to format Markdown files has been modified to use the find command.
• Specific exclusion of Markdown files in the ./docs directory from formatting.

🎯 Purpose & Impact

• Purpose: To improve how the repository formats Markdown files, providing more granular control over which files are selected for formatting.
• Impact: This change prevents the automatic formatting of Markdown files within the ./docs directory, which could be useful to maintain certain formatting specifics in documentation files. Users can expect more consistent and targeted Markdown formatting in the repository, ensuring that docs remain untouched and potentially reducing unexpected changes during auto-formatting processes. 📝🛠️