RFR: 8155902: DataOutputStream writeInt creates 2 packets instead of 1

[Brian Burkhalter]

Add a disclaimer to `java.io.DataOutputStream` to the effect that it makes no guarantee as to how the underlying output stream actually writes the bytes provided to it.

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Commit messages:
 - 8155902: DataOutputStream writeInt creates 2 packets instead of 1

Changes: https://git.openjdk.org/jdk/pull/14791/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14791&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8155902
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14791.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14791/head:pull/14791

PR: https://git.openjdk.org/jdk/pull/14791