Improve intermediate archiv documentation

• Add information how to list files in the archiv.
• Add info that /archiv is only available on export nodes.
• Correct /archive to /archiv where appropriate:
  • doc.zih.tu-dresden.de/docs/data_transfer/datamover.md
  • doc.zih.tu-dresden.de/docs/data_lifecycle/longterm_preservation.md

changed milestone to %Meeting-2022-04-06

assigned to @lazariv--tu-dresden.de

changed the description

marked the checklist item Add information how to list files in the archiv. as completed

marked the checklist item Add info that /archiv is only available on export nodes. as completed

mentioned in merge request !538 (closed)

mentioned in merge request !539 (merged)

marked the checklist item Correct /archive to /archiv where appropriate: as completed

mentioned in commit 4e650111

closed with merge request !539 (merged)

mentioned in commit 1d85e481