Enhance Webhooks Documentation with Detailed Configuration and Usage Examples

[selvaganesh0355]

1. Adding detailed explanations for configuration options and their use cases.
2. Providing structured tables for better readability of configuration parameters.
3. Expanding on the Adding a Webhook section with clear steps and examples.
4. Clarifying webhook handling for GET, POST, and PUT requests with examples.
5. Including links to external tools like Beeceptor for testing and debugging webhooks.