Fixing many link syntaxes in doc comments

sdk/lib/io/file.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.
 
 part of dart.io;
 
 /**
  * The modes in which a File can be opened.
  */
 class FileMode {
@@ skipping 166 matching lines @@
  *         print(len);
  *       });
  *     }
  *
  * In addition to length, the [exists], [lastModified], [stat], and
  * other methods, return Futures.
  *
  * ## Other resources
  *
  * * [Dart by Example](https://www.dartlang.org/dart-by-example/#files-directories-and-symlinks)
- * provides additional task-oriented code samples that show how to use
- * various API from the Directory class and the related [File] class.
+ *   provides additional task-oriented code samples that show how to use
+ *   various API from the Directory class and the related [File] class.
  *
- * * [I/O for Command-Line Apps](https://www.dartlang.org/docs/dart-up-and-running/contents/ch03.html#ch03-dartio---file-and-socket-io-for-command-line-apps)
- * a section from _A Tour of the Dart Libraries_
- * covers files and directories.
+ * * [I/O for Command-Line
+ *   Apps](https://www.dartlang.org/docs/dart-up-and-running/ch03.html#dartio---io-for-command-line-apps)
+ *   a section from _A Tour of the Dart Libraries_ covers files and directories.
  *
  * * [Write Command-Line Apps](https://www.dartlang.org/docs/tutorials/cmdline/),
- * a tutorial about writing command-line apps, includes information
- * about files and directories.
-
+ *   a tutorial about writing command-line apps, includes information about
+ *   files and directories.
  */
 abstract class File implements FileSystemEntity {
   /**
    * Creates a [File] object.
    *
    * If [path] is a relative path, it will be interpreted relative to the
    * current working directory (see [Directory.current]), when used.
    *
    * If [path] is an absolute path, it will be immune to changes to the
    * current working directory.
@@ skipping 668 matching lines @@
       sb.write(": $osError");
       if (path != null) {
         sb.write(", path = '$path'");
       }
     } else if (path != null) {
       sb.write(": $path");
     }
     return sb.toString();
   }
 }