[observe] use consistent comment style

pkg/observe/lib/src/to_observable.dart

 // Copyright (c) 2013, 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.
 
 library observe.src.to_observable;
 
 import 'package:observe/observe.dart';
 
-/**
- * Converts the [Iterable] or [Map] to an [ObservableList] or [ObservableMap],
- * respectively. This is a convenience function to make it easier to convert
- * literals into the corresponding observable collection type.
- *
- * If [value] is not one of those collection types, or is already [Observable],
- * it will be returned unmodified.
- *
- * If [value] is a [Map], the resulting value will use the appropriate kind of
- * backing map: either [HashMap], [LinkedHashMap], or [SplayTreeMap].
- *
- * By default this performs a deep conversion, but you can set [deep] to false
- * for a shallow conversion. This does not handle circular data structures.
- * If a conversion is peformed, mutations are only observed to the result of
- * this function. Changing the original collection will not affect it.
- */
+/// Converts the [Iterable] or [Map] to an [ObservableList] or [ObservableMap],
+/// respectively. This is a convenience function to make it easier to convert
+/// literals into the corresponding observable collection type.
+///
+/// If [value] is not one of those collection types, or is already [Observable],
+/// it will be returned unmodified.
+///
+/// If [value] is a [Map], the resulting value will use the appropriate kind of
+/// backing map: either [HashMap], [LinkedHashMap], or [SplayTreeMap].
+///
+/// By default this performs a deep conversion, but you can set [deep] to false
+/// for a shallow conversion. This does not handle circular data structures.
+/// If a conversion is peformed, mutations are only observed to the result of
+/// this function. Changing the original collection will not affect it.
 // TODO(jmesserly): ObservableSet?
 toObservable(value, {bool deep: true}) =>
     deep ? _toObservableDeep(value) : _toObservableShallow(value);
 
 _toObservableShallow(value) {
   if (value is Observable) return value;
   if (value is Map) return new ObservableMap.from(value);
   if (value is Iterable) return new ObservableList.from(value);
   return value;
 }
 
 _toObservableDeep(value) {
   if (value is Observable) return value;
   if (value is Map) {
     var result = new ObservableMap.createFromType(value);
     value.forEach((k, v) {
       result[_toObservableDeep(k)] = _toObservableDeep(v);
     });
     return result;
   }
   if (value is Iterable) {
     return new ObservableList.from(value.map(_toObservableDeep));
   }
   return value;
 }