DAOS-18472 doc: Note that format replace ignores AdminExcluded (#17610)

Signed-off-by: Tom Nabarro <thomas.nabarro@hpe.com>

Author: tanabarr

docs/admin/administration.md

@@ -1024,6 +1024,12 @@ An examples workflow would be:
   rank will be created).
 - Formatted engine will join using the existing (old) rank which is mapped to the engine's hardware.
 
+!!! note
+    `dmg storage format --replace` can be used to replace a rank in `AdminExcluded` state. The
+    subsequent state of the rank will then no longer be `AdminExcluded`. This special case reduces
+    a chance that a duplicate rank entry is introduced inadvertently because the rank to be replaced
+    is in the `AdminExcluded` state and so is recreated rather than replaced.
+
 ### System Erase
 
 To erase the DAOS sorage configuration, the `dmg system erase`