[jdk21u-dev] RFR: 8316629: j.text.DateFormatSymbols setZoneStrings() exception is unhelpful

[Daniel Hu]

Clean backport. This only changes the error string in DateFormatSymbols. Passes GHA.

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Commit messages:
 - Backport ef49e6c0d7e4e3a2d7d3d8dcb1edf195b23ce12c

Changes: https://git.openjdk.org/jdk21u-dev/pull/1734/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1734&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316629
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1734.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1734/head:pull/1734

PR: https://git.openjdk.org/jdk21u-dev/pull/1734