Fix typo and move initialization of neo to init()

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
+}