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

JDK-8319948 updated the help text for the System.dump_map jcmd. The following line was added to jcmd.md:

    - `-F`: (Optional) File path (STRING, "vm_memory_map_<pid>.txt")

It becomes the following in jcmd.l (the <pid> part is stripped)

\f[V]-F\f[R]: (Optional) File path (STRING,
\[dq]vm_memory_map_.txt\[dq])

The following should have been used instead:

    - `-F`: (Optional) File path (STRING, "vm_memory_map_\<pid\>.txt")