Add comprehensive function documentation to xconfig

[ericbsd]

Add documentation headers to all 50 functions in bin/xconfig to improve code maintainability and developer onboarding. Each function now includes:

• Function name and description
• Parameter specifications with detailed explanations
• Return value documentation
• Practical usage examples

This documentation follows shell script conventions with headers positioned above function definitions.

Key improvements:

• Hardware detection functions (GPU, VM, driver version selection)
• Configuration functions (DRM, legacy drivers, NVIDIA, virtualization)
• Helper functions (rc.conf management, package installation, backup)
• Dialog/menu functions (bsddialog/dialog integration)
• Main entry points (cmd_auto, cmd_debug, interactive menu)

The documentation covers:

• Intel/AMD/NVIDIA GPU detection and configuration
• VirtualBox, VMware, QEMU, Hyper-V, bhyve VM guest support
• NVIDIA driver version selection (latest/470/390/340/304)
• AMD radeonkms vs amdgpu driver selection logic
• X server detection (Xorg vs XLibre)
• Offline package support (/xdrivers) and online fallback

Resolves ghostbsd/issues#318

🤖 Generated with Claude Code

Summary by Sourcery

Documentation:

• Document all hardware detection, configuration, helper, dialog, and entry-point functions in bin/xconfig with standardized headers describing purpose, parameters, return values, and usage examples.

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