Update 7-segment-display-max7219.md

Author: jezdean

7-segment-display-max7219.md

@@ -72,7 +72,7 @@ Connect the module to the microbit and its edge connector as below. Be aware the
 |--- |--- |--- |--- |
 | VCC |  | 3v | |
 | GND |  | GND | |
-| DIN | SOMI, SDI, DI, DIN, SI, MRST. | `pin14` | MISO (master in, slave out) |
+| DIN | SOMI, SDI, DI, DIN, SI, MRST. | `pin15` | MOSI  |
 | CS | nCS, CSN, nSS, STE, SYNC | `pin0` | n/a, but frequently called _chip select_ |
 | CLK | SCLK | `pin13` | Serial Clock |