[LUDOC-519] Add missing documentation for foreign symlink layout

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Bruno Faccini (Inactive)
• Reporter: Bruno Faccini (Inactive)

Description

The foreign symlink feature is a specific use case of the generic foreign layout feature.
Its complete description can be found in LU-12682 Lustre JIRA ticket.
This LUDOC ticket is to address its current lack of documentation.