Add note about license to "Restore an Entire Cluster" docs (#87485) (#…

…108436)

One user reached out mentioning that it would be a good idea to remind
users to re-upload the license after full cluster recovery from snapshot
as one can easily miss this when trying to figure out why some features
aren't working after the restore.

(cherry picked from commit 295fba3)

Co-authored-by: Rafi Estrada <62263912+TheRiffRafi@users.noreply.github.com>

docs/reference/snapshot-restore/restore-snapshot.asciidoc

@@ -448,6 +448,10 @@ POST _snapshot/my_repository/my_snapshot_2099.05.06/_restore
 . When the restore operation is complete, resume indexing and restart any
 features you stopped:
 +
+NOTE: When the snapshot is restored, the license that was in use at the time the snapshot
+was taken will be restored as well. If your license has expired since the snapshot was taken,
+you will need to use the <<update-license,Update License API>> to install a current license.
++
 --
 * GeoIP database downloader and ILM history store
 +