RFR: 8349006: File.getCanonicalPath should remove "(on UNIX platforms)" from its specification

[Brian Burkhalter]

The change made for [JDK-8003887](https://bugs.openjdk.org/browse/JDK-8003887) updated `File.getCanonicalPath` to resolve symbolic links on Windows, but its specification was not modified to reflect this. Here it is proposed to correct that omission.

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Commit messages:
 - 8349006: File.getCanonicalPath should remove "(on UNIX platforms)" from its specification

Changes: https://git.openjdk.org/jdk/pull/23371/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23371&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349006
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/23371.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23371/head:pull/23371

PR: https://git.openjdk.org/jdk/pull/23371