docs: add USDTB/USD and USDTB/NAV price feeds to BLE Testnet (#583)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: aditya@dourolabs.xyz <aditya@dourolabs.xyz>

Author: devin-ai-integration[bot]

pages/price-feeds/sponsored-feeds/evm.mdx

@@ -143,3 +143,5 @@ Update Parameters: **30 seconds heartbeat or 1% price deviation**
 | SUSDE/USD  | `78d185a741d07edb3412b09008b7c5cfb9bbbd7d568bf00ba737b456ba171501` |
 | ENA/USD    | `eaa020c61cc479712813461ce153894a96a6c00b21ed0cfc2798d1f9a9e9c94a` |
 | SUSDE/USDE | `2b89b9dc8fdf9f34709a5b106b472f0f39bb6ca9ce04b0fd7f2e971688e2e53b` |
+| USDTB/NAV  | `967549f1ff4869f41cb354a7116b9e5a9a3091bebe0b2640eeed745ca1f7f90b` |
+| USDTB/USD  | `e4731214382d8ed70a766930a7722c68064fc7ed4e6d70dbce3c84d4be81bc92` |