RFR: 8321958: javadoc error: @returns of ZoneRules#isDaylightSavings() is incorrect

[Naoto Sato]

Small document correction on a return description.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/17098/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17098&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321958
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17098.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17098/head:pull/17098

PR: https://git.openjdk.org/jdk/pull/17098