docs(ble): update bridge docs and troubleshooting

tools/ble/ble_uart_bridge/docs/Quick-Start-BLE-UART-Console.md

@@ -136,7 +136,7 @@ This affects BLE GATT write behavior only. It does not create an application-lev
 Use the [BLE UART Service example](../../../../examples/bluetooth/ble_uart_service) when you want a ready-made ESP-IDF Echo Server for testing BLE UART Bridge Console. After building, flashing, and pairing with the example, open Console and type any text; the example should echo the same data back as `[RX]` output.
 
 ```bash
-# List nearby BLE UART devices and use the printed device ID as DEVICE_ID
+# List nearby BLE devices and use the printed device ID as DEVICE_ID
 python main.py list-devices
 python main.py console AA:BB:CC:DD:EE:FF
 ```
@@ -190,6 +190,14 @@ aa 55 01 00
 - Make sure no other host is already connected to the BLE device.
 - Restart advertising on the device.
 - Run `connection-check` before opening the console.
+- On Linux, reset the system Bluetooth service if connections keep failing,
+  pairing gets stuck, or service discovery cannot find the BLE UART service or
+  characteristics:
+
+  ```bash
+  sudo systemctl stop bluetooth
+  sudo systemctl start bluetooth
+  ```
 
 ### Text looks broken