Add examples taken from reference page (#18066)

tests/pos/fewer-braces.scala

@@ -11,3 +11,57 @@ def Test =
       x + 1
   println(y)
 
+
+  true // Should not count as the call true()
+  ()
+
+  // Setup
+  def times(x: Int)(f: => Unit): Unit =
+    (0 to x).foreach(_ => f)
+  val credentials = Seq()
+  object Path {def userHome = File}
+  object File {def exists = true; def /(s: String) = this}
+  def Credentials(f: File.type) = f
+  val xs = List(1,2,3)
+  def f(x: Int, g: Int => Int) = g(x)
+  val x = 4
+
+  // Copied from docs/_docs/reference/other-new-features/indentation.md
+
+  times(10):
+    println("ah")
+    println("ha")
+
+  credentials `++`:
+    val file = Path.userHome / ".credentials"
+    if file.exists
+    then Seq(Credentials(file))
+    else Seq()
+
+  xs.map:
+    x =>
+      val y = x - 1
+      y * y
+
+  xs.foldLeft(0): (x, y) =>
+    x + y
+
+  {
+    val x = 4
+    f(x: Int, y =>
+      x * (
+        y + 1
+      ) +
+      (x +
+      x)
+    )
+  }
+
+  x match
+  case 1 => print("I")
+  case 2 => print("II")
+  case 3 => print("III")
+  case 4 => print("IV")
+  case 5 => print("V")
+
+  println(".")