use proper notation for true, false, and null in doc comments

sdk/lib/_internal/compiler/implementation/resolution/members.dart

 // Copyright (c) 2012, 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.
 
 part of resolution;
 
 abstract class TreeElements {
   Element get currentElement;
   Setlet<Node> get superUses;
 
@@ skipping 3132 matching lines @@
                              {'value': name});
       }
       return false;
     }
     return true;
   }
 
   /**
    * Try to resolve the constructor that is referred to by [node].
    * Note: this function may return an ErroneousFunctionElement instead of
-   * [null], if there is no corresponding constructor, class or library.
+   * [:null:], if there is no corresponding constructor, class or library.
    */
   FunctionElement resolveConstructor(NewExpression node) {
     return node.accept(new ConstructorResolver(compiler, this));
   }
 
   FunctionElement resolveRedirectingFactory(Return node,
                                             {bool inConstContext: false}) {
     return node.accept(new ConstructorResolver(compiler, this,
                                                inConstContext: inConstContext));
   }
@@ skipping 1613 matching lines @@
     return finishConstructorReference(visit(expression),
                                       expression, expression);
   }
 }
 
 /// Looks up [name] in [scope] and unwraps the result.
 Element lookupInScope(Compiler compiler, Node node,
                       Scope scope, String name) {
   return Elements.unwrap(scope.lookup(name), compiler, node);
 }