RFR: 8336817: DatagramSocket.connect does not specify behavior when already connected [v4]

[Jaikiran Pai]

> Can I please get a review of this doc-only change which updates the javadoc on several methods of the `java.net.DatagramSocket` class to match its current implementation?
> 
> This addresses https://bugs.openjdk.org/browse/JDK-8336817.
> 
> I'll open a CSR once we settle on the proposed text.

Jaikiran Pai has updated the pull request incrementally with one additional commit since the last revision:

  add a note to close() method just like we did for Socket.close()/ServerSocket.close()

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20543/files
  - new: https://git.openjdk.org/jdk/pull/20543/files/27df2721..d9bac1bf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20543&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20543&range=02-03

  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20543.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20543/head:pull/20543

PR: https://git.openjdk.org/jdk/pull/20543