RFR: 8274559: JFR: Typo in 'jfr help configure' text

[Erik Gahlin]

Hi,

Could I have review of a typo. 

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.java.net/jdk/pull/5803/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5803&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274559
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5803.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5803/head:pull/5803

PR: https://git.openjdk.java.net/jdk/pull/5803