RFR: 8274195: Doc cleanup in java.nio.file

[Pavel Rappo]

Please review this trivial change triggered by reading the java.nio.file documentation for an unrelated code review.

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Commit messages:
 - Standardize wording in FileVisitResult constants
 - Update the copyright year
 - Initial commit

Changes: https://git.openjdk.java.net/jdk/pull/5649/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5649&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274195
  Stats: 8 lines in 3 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5649.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5649/head:pull/5649

PR: https://git.openjdk.java.net/jdk/pull/5649