some pincount added for 'info' overlays

src/en/overlay/arduino-spi.md

@@ -3,6 +3,7 @@
 type: content
 name: Arduino SPI
 description: Program Arduino with Raspberry Pi SPI
+pincount: 4
 pin:
   '19':
     name: MOSI

src/en/overlay/ground.md

@@ -3,6 +3,7 @@
 type: info
 name: Ground
 description: Raspberry Pi Ground Pins
+pincount: 1
 pin:
   '6':
   '9':

src/en/overlay/i2c.md

@@ -3,6 +3,7 @@
 type: info
 name: I2C
 description: Raspberry Pi i2c pins
+pincount: 2
 pin:
   '3':
     name: Data

src/en/overlay/uart.md

@@ -3,6 +3,7 @@
 type: info
 name: UART
 description: Raspberry Pi UART pins
+pincount: 2
 pin:
   '8':
     name: TXD / Transmit

src/en/overlay/wiringpi.md

@@ -4,6 +4,7 @@ type: content
 name: WiringPi GPIO Pinout
 url: http://wiringpi.com
 github: https://github.com/WiringPi/WiringPi2-Python
+pincount: 40
 pin:
   '3':
     name: WiringPi 8