Add BOOT/RESET button procedure note for Portable Z-Wave PoE installation

[Copilot]

Summary

Added an important note before the installation steps in the Portable Z-Wave PoE Experiment page to inform users about the special button procedure required to reinstall software on the Waveshare board after Portable Z-Wave firmware has been installed.

Changes

The note explains that once the Waveshare ESP32-S3 ETH board has Portable Z-Wave installed, users need to follow this procedure to install software on it again:

1. Long press the BOOT button
2. Press RESET at the same time
3. Release RESET
4. Release the BOOT button

This critical information is now displayed as a styled informational callout between the Requirements and Installation sections, making it visible before users begin the installation process.

Reference

The instruction is sourced from the Waveshare wiki and helps prevent users from getting stuck when they need to reflash or update the device.

Screenshot

The note appears as a styled informational box with italic text, making it stand out from the regular instructions while maintaining the page's visual consistency.

Original prompt

For the Portable Z-Wave PoE Experiment, note before installation that once Waveshare has Portable Z-Wave installed, to be able to install software on it again: Long press the BOOT button, press RESET at the same time, then release RESET, then release the BOOT button. That instruction is sourced from their wiki: https://www.waveshare.com/wiki/ESP32-S3-ETH#accordion1

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