Fix `Function.apply` dartdoc.

sdk/lib/core/function.dart

Index: sdk/lib/core/function.dart
diff --git a/sdk/lib/core/function.dart b/sdk/lib/core/function.dart
index 5a64e96bb3f3e93bb32227d155029ac1782f541d..9345590100d8e3ab325ddf5b3926768875bd6c22 100644
--- a/sdk/lib/core/function.dart
+++ b/sdk/lib/core/function.dart
@@ -22,13 +22,17 @@ abstract class Function {
    * if it expects different parameters.
    *
    * Example:
-   *       Map<Symbol, dynamic> namedArguments = new Map<Symbol, dynamic>();
-   *       namedArguments[const Symbol("f")] = 4;
-   *       namedArguments[const Symbol("g")] = 5;
-   *       Function.apply(foo, [1,2,3], namedArguments);
+   * ```
+   * var namedArguments = new Map<Symbol, dynamic>();
+   * namedArguments[const Symbol("f")] = 4;
+   * namedArguments[const Symbol("g")] = 5;
+   * Function.apply(foo, [1,2,3], namedArguments);
+   * ```

[Lasse Reichstein Nielsen, 2017/08/23 05:53:31]

How about just doing:

  Function.apply(foo, [1, 2, 3], {#f: 4, #g: 5});

and drop the imperative map creation?

[floitsch, 2017/08/23 18:09:00]

done in https://codereview.chromium.org/3002193002

    *
    * gives exactly the same result as
-   *       foo(1, 2, 3, f: 4, g: 5).
+   * ```
+   * foo(1, 2, 3, f: 4, g: 5).
+   * ```
    *
    * If [positionalArguments] is null, it's considered an empty list.
    * If [namedArguments] is omitted or null, it is considered an empty map.