fixsnapshottopics (opensearch-project#4332)

Signed-off-by: Heather Halter <hdhalter@amazon.com>

Author: hdhalter

_tuning-your-cluster/availability-and-recovery/snapshots/searchable_snapshot.md

@@ -3,7 +3,7 @@ layout: default
 title: Searchable snapshots
 parent: Snapshots
 nav_order: 40
-grand_parent: Availability and Recovery
+grand_parent: Availability and recovery
 redirect_from: 
   - /opensearch/snapshots/searchable_snapshot/
 ---

_tuning-your-cluster/availability-and-recovery/snapshots/sm-api.md

@@ -4,7 +4,7 @@ title: Snapshot management API
 parent: Snapshots
 nav_order: 30
 has_children: false
-grand_parent: Availability and Recovery
+grand_parent: Availability and recovery
 redirect_from: 
   - /opensearch/snapshots/sm-api/
 ---

_tuning-your-cluster/availability-and-recovery/snapshots/snapshot-management.md

@@ -4,7 +4,7 @@ title: Snapshot management
 parent: Snapshots
 nav_order: 20
 has_children: false
-grand_parent: Availability and Recovery
+grand_parent: Availability and recovery
 redirect_from: 
   - /opensearch/snapshots/snapshot-management/
 ---

_tuning-your-cluster/availability-and-recovery/snapshots/snapshot-restore.md

@@ -4,7 +4,7 @@ title: Take and restore snapshots
 parent: Snapshots
 nav_order: 10
 has_children: false
-grand_parent: Availability and Recovery
+grand_parent: Availability and recovery
 redirect_from: 
   - /opensearch/snapshots/snapshot-restore/
   - /opensearch/snapshot-restore/