Improve dev warning message for invalid useEffect usage during render #35275
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This PR improves the developer warning message shown when useEffect is called incorrectly during the render phase.
🔧 What Changed
Refined the warning text for better clarity and guidance.
Made the error message more descriptive to help developers quickly understand the misuse.
No functional behavior changes — documentation & dev-experience improvement only.
🎯 Why This Change Is Useful
Prevents confusion for beginners misusing useEffect.
Reduces debugging time by giving clearer guidance.
Improves overall DX (Developer Experience) in React.
🧪 Testing
Manually verified that the updated warning message appears correctly in development mode.
No runtime behavior is affected.