fix format

ch5/ch5-10.md

@@ -9,9 +9,9 @@
 ```Go
 func Parse(input string) (s *Syntax, err error) {
 	defer func() {
-	if p := recover(); p != nil {
-		err = fmt.Errorf("internal error: %v", p)
-	}
+		if p := recover(); p != nil {
+			err = fmt.Errorf("internal error: %v", p)
+		}
 	}()
 	// ...parser...
 }
@@ -36,10 +36,8 @@ func soleTitle(doc *html.Node) (title string, err error) {
 	type bailout struct{}
 	defer func() {
 		switch p := recover(); p {
-		case nil:
-		// no panic
-		case bailout{}:
-		// "expected" panic
+		case nil:       // no panic
+		case bailout{}: // "expected" panic
 			err = fmt.Errorf("multiple title elements")
 		default:
 			panic(p) // unexpected panic; carry on panicking