RFR: 8024695: new File("").exists() returns false whereas it is the current working directory

[Brian Burkhalter]

Update the specification of `java.io.File.exists()` to match its behavior, which seems correct in the context of how the empty abstract pathname is documented elsewhere in the class.

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Commit messages:
 - 8024695: new File("").exists() returns false whereas it is the current working directory

Changes: https://git.openjdk.org/jdk/pull/22821/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22821&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8024695
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22821.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22821/head:pull/22821

PR: https://git.openjdk.org/jdk/pull/22821