Fix typo and move initialization of neo to init()

examples/ws2812/arduino.go

@@ -4,6 +4,8 @@ package main
 
 import "machine"
 
-// Replace neo in the code below to match the pin
-// that you are using if different.
-var neo = machine.D2
+func init() {
+	// Replace neo in the code below to match the pin
+	// that you are using if different.
+	neo = machine.D2
+}

examples/ws2812/digispark.go

@@ -4,7 +4,9 @@ package main
 
 import "machine"
 
-// This is the pin assignment for the Digispark only.
-// Replace neo and led in the code below to match the pin
-// that you are using if different.
-var neo machine.Pin = 0
+func init() {
+	// This is the pin assignment for the Digispark only.
+	// Replace neo and led in the code below to match the pin
+	// that you are using if different.
+	neo = machine.Pin(0)
+}

examples/ws2812/main.go

@@ -13,7 +13,7 @@ import (
 )
 
 var (
-	noe  machine.Pin
+	neo  machine.Pin
 	leds [10]color.RGBA
 )
 

examples/ws2812/others.go

@@ -4,6 +4,8 @@ package main
 
 import "machine"
 
-// Replace neo in the code below to match the pin
-// that you are using if different.
-var neo machine.Pin = machine.WS2812
+func init() {
+	// Replace neo in the code below to match the pin
+	// that you are using if different.
+	neo = machine.WS2812
+}