Improve troubleshooting for unstable CAN

[daniel1302]

I was troubleshooting CAN and those are findings and commands that helped.

[Copilot]

Pull Request Overview

This PR enhances troubleshooting documentation for unstable CAN communication by adding a comprehensive section on Raspberry Pi OS (Bookworm, 64-bit) CAN stability settings. The documentation addresses common CAN buffer issues and provides specific configuration steps to resolve them.

Key changes:

• Adds detailed CAN stability troubleshooting section with common error symptoms
• Provides three specific configuration solutions: queue length enforcement, USB autosuspend disabling, and socket buffer size increases
• Includes practical shell commands and verification steps for each solution

Comments suppressed due to low confidence (1)

troubleshooting/timer_too_close.md:57

• Consider using $(command -v ip) directly in the udev rule instead of hardcoding the path, which would eliminate the need for this manual step and make the solution more portable across different systems.

NOTE: If /usr/sbin/ip isn’t the correct path on your system, replace it with the output of command -v ip.

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