RFR: 8252113: Move jfr man page into jfr module

[Magnus Ihse Bursie]

Man pages should be placed in the same module as the corresponding executable. For some reason, this was done incorrectly for jfr, where the executable is provided by jdk.jfr, but the man page was in java.base.

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Commit messages:
 - 8252113: Move jfr man page into jfr module

Changes: https://git.openjdk.java.net/jdk/pull/879/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=879&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252113
  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/879.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/879/head:pull/879

PR: https://git.openjdk.java.net/jdk/pull/879