Clarify presentation of the target in retaining paths.

runtime/observatory/lib/src/elements/inbound_references.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.
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/curly_block.dart';
 import 'package:observatory/src/elements/instance_ref.dart';
 import 'package:observatory/src/elements/helpers/any_ref.dart';
@@ skipping 75 matching lines @@
       return const [];
     }
     return _inbounds.elements.map(_createItem).toList();
   }
 
   Element _createItem(M.InboundReference reference) {
     final content = <Element>[];
 
     if (reference.parentField != null) {
       content.addAll([
-        new SpanElement()..text = 'from ',
+        new SpanElement()..text = 'referenced by ',
         anyRef(_isolate, reference.parentField, _instances, queue: _r.queue),
         new SpanElement()..text = ' of '
       ]);
     } else if (reference.parentListIndex != null) {
       content.add(new SpanElement()
-        ..text = 'from [ ${reference.parentListIndex} ] of ');
+        ..text = 'referenced by [ ${reference.parentListIndex} ] of ');
     } else if (reference.parentWordOffset != null) {
       content.add(new SpanElement()
-        ..text = 'from word [ ${reference.parentWordOffset} ] of ');
+        ..text = 'referenced by offset ${reference.parentWordOffset} of ');
     }
 
     content.addAll([
       anyRef(_isolate, reference.source, _instances, queue: _r.queue),
-      new SpanElement()..text = ' referenced by ',
       new InboundReferencesElement(
           _isolate, reference.source, _references, _instances,
           queue: _r.queue)
     ]);
 
     return new DivElement()
       ..classes = ['indent']
       ..children = content;
   }
 }