RFR: 8265407: JFR: Fix Typos

[Erik Gahlin]

Hi,

Could I have a review of a fix that takes care of couple of typos.

Testing: test/jdk/jdk/jfr/

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.java.net/jdk/pull/3562/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3562&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265407
  Stats: 4 lines in 2 files changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3562.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3562/head:pull/3562

PR: https://git.openjdk.java.net/jdk/pull/3562