Merge pull request scala#2464 from geminicaprograms/patch-1

nit: redundant call to `sb.toString` before print

Author: bishabosha

_overviews/scala3-book/methods-main-methods.md

@@ -49,8 +49,7 @@ For example, given this `@main` method that takes an `Int`, a `String`, and a va
 
   val sb = StringBuilder(s"Happy $age$suffix birthday, $name")
   for other <- others do sb.append(" and ").append(other)
-  sb.toString
-  println(sb)
+  println(sb.toString)
 ```
 
 When you compile that code, it creates a main program named `happyBirthday` that’s called like this: