fix doc comments in dart:io and collection types

sdk/lib/collection/iterable.dart

Index: sdk/lib/collection/iterable.dart
diff --git a/sdk/lib/collection/iterable.dart b/sdk/lib/collection/iterable.dart
index 667905a7012ec58167df5f97319b2c9c4fcdef71..4eb5c2f4d791c2601871e301d3e119968388e87e 100644
--- a/sdk/lib/collection/iterable.dart
+++ b/sdk/lib/collection/iterable.dart
@@ -76,9 +76,9 @@ abstract class IterableMixin<E> implements Iterable<E> {
     return buffer.toString();
   }
 
-  bool any(bool f(E element)) {
+  bool any(bool test(E element)) {
     for (E element in this) {
-      if (f(element)) return true;
+      if (test(element)) return true;
     }
     return false;
   }