Fix spelling mistakes

examples/blinker/blinker.go

@@ -12,9 +12,10 @@ package main
 
 import (
 	"fmt"
-	"github.com/stianeikeland/go-rpio/v4"
 	"os"
 	"time"
+
+	"github.com/stianeikeland/go-rpio/v4"
 )
 
 var (

examples/event/event.go

@@ -39,7 +39,7 @@ func main() {
 	fmt.Println("press a button")
 
 	for i := 0; i < 2; {
-		if pin.EdgeDetected() { // check if event occured
+		if pin.EdgeDetected() { // check if event occurred
 			fmt.Println("button pressed")
 			i++
 		}

rpio.go

@@ -8,11 +8,11 @@ Supports simple operations such as:
        - Pin read (high/low)
        - Pin edge detection (no/rise/fall/any)
        - Pull up/down/off
-Also clock/pwm related oparations:
+Also clock/pwm related operations:
        - Set Clock frequency
        - Set Duty cycle
-And SPI oparations:
-       - SPI transmit/recieve/exchange bytes
+And SPI operations:
+       - SPI transmit/receive/exchange bytes
        - Set speed
        - Chip select
 
@@ -264,7 +264,7 @@ func (pin Pin) PullDown() {
 	PullMode(pin, PullDown)
 }
 
-// PullOff: Disable pullup/down on pin
+// PullOff: Disable pullup or pulldown on pin
 func (pin Pin) PullOff() {
 	PullMode(pin, PullOff)
 }

spi.go

@@ -21,6 +21,7 @@ const (
 )
 
 var (
+	// Will not fix this error's naming (would be a breaking change)
 	SpiMapError = errors.New("SPI registers not mapped correctly - are you root?")
 )
 
@@ -118,7 +119,7 @@ func SpiMode(polarity uint8, phase uint8) {
 // Data received from slave are ignored.
 // Use spread operator to send slice of bytes.
 func SpiTransmit(data ...byte) {
-	SpiExchange(append(data[:0:0], data...)) // clone data because it will be rewriten by received bytes
+	SpiExchange(append(data[:0:0], data...)) // clone data because it will be rewritten by received bytes
 }
 
 // SpiReceive receives n bytes from slave.
@@ -183,7 +184,7 @@ func getSpiPins(dev SpiDev) []Pin {
 	switch dev {
 	case Spi0:
 		return []Pin{7, 8, 9, 10, 11}
-		// ommit 35, 36, 37, 38, 39 - only one set of SPI0 can be set in Spi mode at a time
+		// omit 35, 36, 37, 38, 39 - only one set of SPI0 can be set in Spi mode at a time
 	case Spi1:
 		return []Pin{16, 17, 18, 19, 20, 21}
 	case Spi2: