RFR: 8294672: Typo in description of JDWP VirtualMachine/AllThreads command

[Chris Plummer]

Fix typo: "and and" => "and"

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Commit messages:
 - fix typo in VirtualMachine.AllThreads

Changes: https://git.openjdk.org/jdk/pull/10895/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10895&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294672
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10895.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10895/head:pull/10895

PR: https://git.openjdk.org/jdk/pull/10895