Fixing many link syntaxes in doc comments

sdk/lib/io/file.dart

Index: sdk/lib/io/file.dart
diff --git a/sdk/lib/io/file.dart b/sdk/lib/io/file.dart
index 691d7837445fff4f286dbe4460652e430887b4ef..d9b2cb41c5b80f2176f75fb950c5cb401e163cc7 100644
--- a/sdk/lib/io/file.dart
+++ b/sdk/lib/io/file.dart
@@ -184,17 +184,16 @@ enum FileLock {
  * ## 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 {
   /**