all: fix a few typos

cmd/shfmt/main.go

@@ -360,7 +360,7 @@ func walkPath(path string, entry fs.DirEntry) error {
 	//
 	// TODO: Should there be a way to explicitly turn off ignore rules when walking?
 	// Perhaps swapping the default to --apply-ignore=auto and allowing --apply-ignore=false?
-	// I don't imagine it's a particularly uesful scenario for now.
+	// I don't imagine it's a particularly useful scenario for now.
 	props, err := ecQuery.Find(path, []string{"shell"})
 	if err != nil {
 		return err

interp/interp_test.go

@@ -3743,7 +3743,7 @@ var testBuiltinsMap = map[string]func(interp.HandlerContext, []string) error{
 		return os.Link(oldname, newname)
 	},
 	"touch": func(hc interp.HandlerContext, args []string) error {
-		filenames := args // create all arugments as filenames
+		filenames := args // create all arguments as filenames
 
 		newTime := time.Now()
 		if args[0] == "-t" {
@@ -4369,7 +4369,7 @@ func TestReadShouldNotPanicWithNilStdin(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), runnerRunTimeout)
 	defer cancel()
 	if err := r.Run(ctx, f); err == nil {
-		t.Fatal("it should have retuned an error")
+		t.Fatal("it should have returned an error")
 	}
 }