RFR: 8294758: JFR: Docs build fails after changes to RecordedObject and Timespan

[Erik Gahlin]

Hi,

Could I have a review of a change that fixes a docs build failure after JDK-8294242.

Testing: build docs

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/10555/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10555&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294758
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10555.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10555/head:pull/10555

PR: https://git.openjdk.org/jdk/pull/10555