Update is_url()

[glenn-jocher]

Signed-off-by: Glenn Jocher [email protected]

🛠️ PR Summary

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🌟 Summary

Enhanced URL checking functionality in YOLOv5 utility script.

📊 Key Changes

• Renamed the parameter check_online to check_exists in the is_url function.
• Clarified the function's docstring to better describe its dual purpose: verifying string is a URL and checking its existence.

🎯 Purpose & Impact

• 🎨 Enhanced code readability and clarity by renaming parameters to better reflect their functionality.
• 🛠 Improved documentation helps developers understand the purpose of the code at a glance.
• 🌐 Reduces the potential for confusion among developers working with YOLOv5's codebase, possibly preventing future bugs related to URL checking.