Updated comments to reflect correct values

Author: turkycat

Boards.h

@@ -251,9 +251,9 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #define IS_PIN_ANALOG(p)        ((p) >= 15 && (p) < 15 + TOTAL_ANALOG_PINS)
 #define IS_PIN_PWM(p)           digitalPinHasPWM(p)
 #define IS_PIN_SERVO(p)         (IS_PIN_DIGITAL(p) && (p) < MAX_SERVOS) // deprecated since v2.4
-#define IS_PIN_I2C(p)           ((p) == 11 || (p) == 12) // SDA = 20, SCL = 21
-#define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK) // SS = A2
-#define IS_PIN_SERIAL(p)        ((p) == PIN_SERIAL1_RX || (p) == PIN_SERIAL1_TX)
+#define IS_PIN_I2C(p)           ((p) == 11 || (p) == 12) // SDA = 11, SCL = 12
+#define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK)
+#define IS_PIN_SERIAL(p)        ((p) == PIN_SERIAL1_RX || (p) == PIN_SERIAL1_TX) //defined in variant.h  RX = 13, TX = 14
 #define PIN_TO_DIGITAL(p)       (p)
 #define PIN_TO_ANALOG(p)        ((p) - 15)
 #define PIN_TO_PWM(p)           PIN_TO_DIGITAL(p)