ENG-7548: update rx.Config docstring

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ENG-7548 Update rx.Config docstring in reflex-oss

[greptile-apps]

Greptile Summary

This PR enhances the docstring for the Config class in reflex/config.py, transforming a minimal documentation string into comprehensive, developer-friendly documentation. The change adds detailed examples showing how to configure Reflex applications using rxconfig.py, demonstrates environment variable overrides with the REFLEX_ prefix, and organizes configuration options into logical categories (App Settings, Server, Database, Frontend, State Management, and Plugins).

The enhanced docstring serves as an in-code reference guide that developers will see when using IDEs or reading the source code. It provides practical examples for common configuration scenarios like database connections (db_url), CORS settings (cors_allowed_origins), and frontend package management (frontend_packages). The documentation also updates the reference link to point to a more specific configuration guide at reflex.dev/docs/advanced-onboarding/configuration.

This change integrates well with Reflex's existing configuration system, which already supports environment variable overrides and the rxconfig.py file structure. The docstring now matches the sophistication of the underlying configuration management system that handles database connections, plugin management, and various runtime settings through the BaseConfig and Config classes.

Confidence score: 5/5

• This PR is extremely safe to merge with no risk of breaking existing functionality
• Score reflects that this is purely a documentation improvement with no code changes to logic, data structures, or functionality
• No files require special attention as this only modifies inline documentation

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[codspeed-hq]

CodSpeed Performance Report

Merging #5752 will not alter performance

_{Comparing ahmad/update-config-docstring (efa36cf) with main (39a07b6)}

Summary

✅ 8 untouched benchmarks