RFR: 8283642: JavaDoc of JFileChooser() need to be updated for default directory in Windows

[Prasanta Sadhukhan]

Default directory name has changed from "My Documents" to "Documents" in recent WIndows version, so javadoc needs to be updated.

-------------

Commit messages:
 - 8283642: JavaDoc of JFileChooser() need to be updated for default directory in Windows

Changes: https://git.openjdk.java.net/jdk/pull/7983/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7983&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283642
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7983.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7983/head:pull/7983

PR: https://git.openjdk.java.net/jdk/pull/7983