RFR: 8325994: JFR: Examples in JFR.start help use incorrect separator

[Erik Gahlin]

Could I have review of a fix that changes the separator in the help text for JFR.start from "," to " ".

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/17884/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17884&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325994
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17884.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17884/head:pull/17884

PR: https://git.openjdk.org/jdk/pull/17884