RFR: 8267569: java.io.File.equals contains misleading Javadoc

[Brian Burkhalter]

Modify the specification of `java.io.File.equals` to clarify that equality is based only on a comparison of abstract pathnames as opposed to the file system objects that the `File`s represent.

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Commit messages:
 - 8267569: java.io.File.equals contains misleading Javadoc

Changes: https://git.openjdk.java.net/jdk/pull/4232/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4232&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267569
  Stats: 9 lines in 1 file changed: 4 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4232.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4232/head:pull/4232

PR: https://git.openjdk.java.net/jdk/pull/4232