Check for documented getters when checking setters (#237).

test/rules/public_member_api_docs.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // test w/ `dart test/util/solo_test.dart public_member_api_docs`
 
 abstract class A //LINT
 {
+
+  /// Zapp.
+  int get zapp => 0;
+  set zapp(int z) //OK
+  { }
+
+  int get zapp2 => 0; //LINT
+  /// Zapp.
+  set zapp2(int z) { }
+
   static const Z = 1; //LINT
   static int _Z = 13; //OK
 
   A(); //LINT
   A.named(); //LINT
   A._(); //OK
   int x; //LINT
   int _y; //OK
   int z, //LINT
      _z; //OK
   /// Doc.
   a() {
     inner() => null; //OK
   }
 
   // No doc.
   b(); //LINT
 
   c(); //LINT
 }
 
+/// Zapp.
+int get zapp => 0;
+set zapp(int z) //OK
+{ }
+
+int get zapp2 => 0; //LINT
+/// Zapp.
+set zapp2(int z) { }
+
+
 main() //OK
 { }
 
 typedef bool t(Object o); //LINT
 
 abstract class _B {
   a(); //OK
 }
 
 enum E //LINT
@@ skipping 21 matching lines @@
 
 /// Bar.
 bar() => null; //OK
 
 int g; //LINT
 
 int _h; //OK
 
 int gg, //LINT
    _gg; //OK
+
+/// ZZ.
+class ZZ {
+  /// Z.
+  int get z => 0;
+}
+
+/// ZZZ.
+class ZZZ extends ZZ {
+  set z(int z) //OK
+  { }
+}