docs: improve wolfBoot documentation for Xilinx UltraScale+ MPSoC

[devin-ai-integration]

Improve wolfBoot Documentation for Xilinx UltraScale+ MPSoC

This PR improves the documentation for building and using wolfBoot with Xilinx UltraScale+ MPSoC by:

• Adding a clear table of contents
• Adding prerequisites section
• Adding quick start guide
• Reorganizing build instructions with validation steps
• Improving flashing instructions
• Adding troubleshooting section
• Improving partition table presentation
• Adding debugging and advanced topics sections

Testing

These changes are documentation-only and have been reviewed for accuracy against the original content.

Link to Devin run

https://app.devin.ai/sessions/4d639326bd714b8fb9c110658f5d4eac

Requested by

[email protected]

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add "(aside)" to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring