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

[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.

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Commit messages:
 - 8336817: DatagramSocket.connect does not specify behavior when already connected

Changes: https://git.openjdk.org/jdk/pull/20543/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20543&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336817
  Stats: 34 lines in 1 file changed: 7 ins; 1 del; 26 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