Correct a typo

Signed-off-by: Alexander Seiler <[email protected]>

main.go

@@ -265,8 +265,8 @@ func main() {
 		fmt.Fprintln(os.Stderr, fmt.Errorf("error parsing avail-threshold: invalid option '%s'", *availThreshold))
 		os.Exit(1)
 	}
-	for _, thresold := range availbilityThresholds {
-		_, err = stringToSize(thresold)
+	for _, threshold := range availbilityThresholds {
+		_, err = stringToSize(threshold)
 		if err != nil {
 			fmt.Fprintln(os.Stderr, "error parsing avail-threshold:", err)
 			os.Exit(1)
@@ -279,8 +279,8 @@ func main() {
 		fmt.Fprintln(os.Stderr, fmt.Errorf("error parsing usage-threshold: invalid option '%s'", *usageThreshold))
 		os.Exit(1)
 	}
-	for _, thresold := range usageThresholds {
-		_, err = strconv.ParseFloat(thresold, 64)
+	for _, threshold := range usageThresholds {
+		_, err = strconv.ParseFloat(threshold, 64)
 		if err != nil {
 			fmt.Fprintln(os.Stderr, "error parsing usage-threshold:", err)
 			os.Exit(1)