add ther other Adafruit displauy and a comment about A0.

meshtastic/mesh.proto

@@ -610,7 +610,9 @@ enum HardwareModel {
    * Adafruit Feather RP2040 with RFM95 LoRa Radio RFM95 with SX1272, SSD1306 OLED
    * https://www.adafruit.com/product/5714
    * https://www.adafruit.com/product/326
-   * 
+   * https://www.adafruit.com/product/938
+   *  ^^^ short A0 to switch to I2C address 0x3C
+   *
    */
 RP2040_FEATHER_RFM95 = 75;