The "Middleware Registration" example in docs/whats_new.md contained ["/v1", "/v2"] — a non-Go array syntax that does not compile.

Changes introduced

• Documentation Update: Fixed ["/v1", "/v2"] → []string{"/v1", "/v2"} in the app.Use multi-prefix example in docs/whats_new.md.

// Before (invalid — does not compile)
app.Use(["/v1", "/v2"], func(c fiber.Ctx) error {

// After (valid Go)
app.Use([]string{"/v1", "/v2"}, func(c fiber.Ctx) error {

Type of change

• Documentation update (changes to documentation)

Checklist

• Followed the inspiration of the Express.js framework for new functionalities, making them similar in usage.
• Conducted a self-review of the code and provided comments for complex or critical parts.
• Updated the documentation in the /docs/ directory for Fiber's documentation.
• Added or updated unit tests to validate the effectiveness of the changes or new features.
• Ensured that new and existing unit tests pass locally with the changes.
• Verified that any new dependencies are essential and have been agreed upon by the maintainers/community.
• Aimed for optimal performance with minimal allocations in the new code.
• Provided benchmarks for the new code to analyze and improve upon.

Commit formatting

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• Fixes 🐛 [Bug]: incorrect Go code in the documentation #4094

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