docs(usb): Update ESP32-P4 USB pins to MP version

Closes #16136

Author: tore-espressif

examples/peripherals/usb/README.md

@@ -22,7 +22,7 @@ ESP BOARD       USB CONNECTOR (type A)
 |              | USB_DP | USB_DM |
 | ------------ | ------ | ------ |
 | ESP32-S2/S3  | GPIO20 | GPIO19 |
-| ESP32-P4 2.0 | pin 51 | pin 50 |
+| ESP32-P4 2.0 | pin 50 | pin 49 |
 | ESP32-P4 1.1 | GPIO27 | GPIO26 |
 
 > Note: On the ESP32-P4, the USB 2.0 PHY pins are dedicated to USB-OTG functionality and cannot be used as general-purpose GPIOs.