When ID is null, TimeZone.getTimeZone(String ID) throws a NullPointerException.
For example, String someID = null; TimeZone tz1 = TimeZone.getTimeZone(someID); ``` throws a `NullPointerException` This change updates the documentation to make this apparent. ------------- Commit messages: - Add missing @throws Changes: https://git.openjdk.org/jdk/pull/11888/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11888&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8177418 Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/11888.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11888/head:pull/11888 PR: https://git.openjdk.org/jdk/pull/11888
