Update meta and logging library descriptions; tweak fixnum

pkg/meta/lib/meta.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.
 
 /**
- * This library contains the definitions of annotations that provide additional
- * semantic information about the program being annotated. These annotations are
- * intended to be used by tools to provide a better user experience.
+ * Constants for use in metadata annotations such as
+ * `@deprecated`, `@override`, and `@proxy`.
+ * 
+ * Annotations provide semantic information
+ * that tools can use to provide a better user experience.
+ * For example, an IDE might not autocomplete
+ * the name of a function that's been marked `@deprecated`,
+ * or it might display the function's name differently.
  *
- * ## Installing ##
- *
- * Use [pub][] to install this package. Add the following to your `pubspec.yaml`
- * file.
- *
- *     dependencies:
- *       meta: any
- *
- * Then run `pub install`.
- *
- * For more information, see the
- * [meta package on pub.dartlang.org](http://pub.dartlang.org/packages/meta).
- *
- * [pub]: http://pub.dartlang.org
+ * For information on installing and importing this library, see the
+ * [meta package on pub.dartlang.org]
+ * (http://pub.dartlang.org/packages/meta).
+ * For examples of using annotations, see
+ * [Metadata](https://www.dartlang.org/docs/dart-up-and-running/contents/ch02.html#ch02-metadata)
+ * in the language tour.
  */
 library meta;
 
 /**
  * An annotation used to mark a class, field, getter, setter, method, top-level
  * variable, or top-level function as one that should no longer be used. Tools
  * can use this annotation to provide a warning on references to the marked
  * element.
  */
 const deprecated = const _Deprecated();
@@ skipping 20 matching lines @@
  * member. Tools should provide a hint if this annotation is applied to a class
  * that does not implement or inherit an implementation of the method
  * [:noSuchMethod:] (other than the implementation in [Object]). Note that
  * classes are not affected by the use of this annotation on a supertype.
  */
 const proxy = const _Proxy();
 
 class _Proxy {
   const _Proxy();
 }