Update pins description

PINS

@@ -1,8 +1,7 @@
 /* Connections: (PDIP)
  *
- *  1: PB0      - Output, RTTY space
- *  2: PB1      - Output, RTTY Mark
- *  3: PB2      - Enable Radio
+ *  1: PB0      - Output RTTY
+ *  2: PB1      - Enable Radio
  *  5: PB4      - To pin 1 of MMC card (/CS)
  *  6: PB5/MOSI - To pin 4 of ISP header
  *              - To pin 2 of MMC card
@@ -17,8 +16,8 @@
  * 13: XTAL1    - 7.3728 MHz crystal
  * 14: PD0/RXD0 - Input, UART camera
  * 15: PD1/TXD0 - Output, UART camera
- * 16: PD2/RXD1 - Input, GPS data
- * 17: PD3/TXD1 - Output, not connected - GPS receive only
+ * 16: PD2/RXD1 - Input, GPS receiver
+ * 17: PD3/TXD1 - Output, GPS receiver
  * 30: AVCC     - 3.3v
  * 31: GND      - GND
 */