update docs to alert users of pgbackrest limitations in 3.4
@@ -657,6 +657,10 @@ configuration maps with the label `crunchy-scheduler=true` in a specific namespa
After finding the schedule configs, the scheduler service will either exec into the container (pgBackRest) or
create pgBaseBackup jobs for the configured schedule.
+NOTE: in operator version 3.4.0, you are REQUIRED, a single time, to run a
+pgbackrest backup PRIOR to creating a pgbackrest schedule. This will not be
+a requirement in the 3.5.0 version of the Operator.
+
==== Syntax
$ pgo create schedule NAME [FLAGS]
