backup.md: fix incorrect path names
-
backup.md: clarify the usage of directories in command examples
-
also: edit picodata paramaters usage for more consitency and clarity in tutorials
-
Cherry-pick to: 24.2 and 24.3
-
Staging: https://docs.binary.picodata.io/picodata/at_rsync_fix/tutorial/backup/
Edited by Alexander Tolstoy