(DOCSP-29953) Fixes example. (#1338)

Author: erabil-mdb

source/includes/steps-configure-filesystem-store.yaml

@@ -64,7 +64,8 @@ content: |
                           mountPath: /snapshot_store  
           backup:
             enabled: true
-            fileSystemStores: filesystem1
+            fileSystemStores:
+              - name: filesystem1
              assignmentLabels: ["test1", "test2"]
             opLogStores:
               assignmentLabels: ["test1", "test2"]