RFR: 8334145: <pid> missing from vm_memory_map_<pid>.txt in System.dump_map help text

[Chris Plummer]

Fix issue with `<pid>` argument.

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

Commit messages:
 - Fix quoting of pid argument

Changes: https://git.openjdk.org/jdk/pull/20246/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20246&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334145
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20246.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20246/head:pull/20246

PR: https://git.openjdk.org/jdk/pull/20246