docs: fix a typo

replace "sheduled" with "scheduled"

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

docs/source/backup/examples.rst

@@ -127,7 +127,7 @@ replacing the ``-c`` cluster flag with your cluster's cluster name or ID and rep
 Create backup for archiving keyspace
 ------------------------------------
 
-We can archive any particular keyspace, and keep it in our bucket regardless of an already sheduled backups.
+We can archive any particular keyspace, and keep it in our bucket regardless of an already scheduled backups.
 
 **Procedure**