[jdk19] RFR: 8288836: (fs) Files.writeString spec for IOException has "specified charset" when no charset is provided

[Brian Burkhalter]

Change "specified charset" to "UTF-8" in specification of `IOException` thrown by `Files.writeString(Path path, CharSequence csq, OpenOption... options)`.

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Commit messages:
 - 8288836: (fs) Files.writeString spec for IOException has "specified charset" when no charset is provided

Changes: https://git.openjdk.org/jdk19/pull/79/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=79&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288836
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk19/pull/79.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/79/head:pull/79

PR: https://git.openjdk.org/jdk19/pull/79