DOCSP-13999 correct typo cp restore backup

Author: andf-mongodb

source/includes/steps-restore-sharded-shard-primary-from-backup.yaml

@@ -88,7 +88,7 @@ content: |
 
               .. code-block:: sh
 
-                 c -a /backup/mongodb/path/to/mongodb /path/to/mongodb
+                 cp -a /backup/mongodb/path/to/mongodb /path/to/mongodb
 
               The ``-a`` option recursively copies the contents of
               the source path to the destination path while preserving