[improve] fix doc & fix listfilesondisc cmd description #4184
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Descriptions of the changes in this PR:
Journal settings
For example:
journalDirectories=/tmp/bk-journal1,/tmp/bk-journal2
If journalDirectories is set, bookies will skip journalDirectory and use this setting directory.
journalDirectories
.The directory to which Bookkeeper outputs its write-ahead log (WAL).
Motivation
update doc about conf#JournalDirectory 2 conf#JournalDirectories& fix listfilesondisc cmd description
Changes
Master Issue: #4183