Add banner to wifi testing page

docs/WifiPerformance.md

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 All wireless adapters were tested under consistent conditions - each positioned in close proximity (1-2m) and connected to the same wireless access point (AP). The adapters utilized various interface types, including USB, SDIO, and PCI, to evaluate performance across different hardware configurations.
 
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 ## Test Equipment
 
 - **Access Point**: [Zyxel NWA130BE (Wi-Fi 7)](https://amzn.to/428dvnH)
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 - [USB WiFi Adapter Information for Linux](https://github.com/morrownr/USB-WiFi)
 - [Official Linux Wireless documentation](https://wireless.docs.kernel.org/en/latest/index.html)
-- [Armbian forum - Advanced users - Development](https://forum.armbian.com/forum/4-advanced-users-development/)
+- [Armbian forum - Advanced users - Development](https://forum.armbian.com/forum/4-advanced-users-development/)