RFR: 8272963: Update the java manpage markdown source

[David Holmes]

Please review this trivial change that takes the new Xlog help output produced by JDK-8271186 "Add UL option to replace newline char":
https://github.com/openjdk/jdk/commit/b16a04ebf749a93d89fb51b96baceff36fe1d730#diff-d05029afe6aed86f860a10901114402f1f6af4fe1e4b46d883141ab1d2a527b8

and adjusts it to match the actual conversion process from the markdown file to the nroff file.

Thanks,
David

-------------

Commit messages:
 - Restore JFR update missing in markdown source
 - Fixed version string
 - 8272963: Update the java manpage markdown source

Changes: https://git.openjdk.java.net/jdk/pull/5300/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5300&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272963
  Stats: 16 lines in 1 file changed: 4 ins; 1 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5300.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5300/head:pull/5300

PR: https://git.openjdk.java.net/jdk/pull/5300