aghtest: fix os_windows

internal/aghtest/os_windows.go

@@ -5,7 +5,6 @@ package aghtest
 import (
 	"io/ioutil"
 	"os"
-	"runtime"
 	"testing"
 	"time"
 
@@ -21,8 +20,8 @@ const (
 func prepareTestDir(t *testing.T) (dir string) {
 	// Windows, including the version of Windows Server that Github Actions
 	// uses, apparently likes to overly eagerly inspect new directories with
-	// its Windows Defender.  Disabpling it might require additional
-	// workarounds, and until we've fitured it out, just retry the deletion
+	// its Windows Defender.  Disabling it might require additional
+	// workarounds, and until we've figured it out, just retry the deletion
 	// until the error goes away.
 	//
 	// The code is largely inspired by the one that has been introduced into