RFR: JDK-8319628: DateFormat does not mention IllegalArgumentException for invalid style args [v2]

[Justin Lu]

> Please review this PR and [CSR](https://bugs.openjdk.org/browse/JDK-8319868) which makes IllegalArgumentExceptions apparent for the _j.text.DateFormat_ static factory methods that have the _style_ parameter.

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  reflect review, one -> any

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16624/files
  - new: https://git.openjdk.org/jdk/pull/16624/files/f1a4b6c9..fa795543

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16624&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16624&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16624.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16624/head:pull/16624

PR: https://git.openjdk.org/jdk/pull/16624