Improve documentation for LinearSearch implementation

[AbhiramSakha]

What would you like to share?

The LinearSearch implementation works correctly, but adding more detailed documentation would improve readability for beginners.

Suggested improvements:

• Add step-by-step explanation of how the algorithm works
• Include a simple example input/output
• Clearly mention time complexity (O(n))

This would make the implementation easier to understand for new contributors.

Additional information

No response