Update descriptions for the different backrest/backup storage configs

Some of the legacy purposes of what this parameter did, which
was both confusing and inaccurate. This adds some clarity.

Reported by:  Andreas Karlsson <[email protected]>

Author: Jonathan S. Katz

docs/content/Configuration/pgo-yaml-configuration.md

@@ -45,9 +45,9 @@ The *pgo.yaml* file is broken into major sections as described below:
 | Setting|Definition  |
 |---|---|
 |PrimaryStorage    |required, the value of the storage configuration to use for the primary PostgreSQL deployment
-|BackupStorage    |required, the value of the storage configuration to use for backups, including the storage for pgbackrest repo volumes
 |ReplicaStorage    |required, the value of the storage configuration to use for the replica PostgreSQL deployments
-|BackrestStorage    |required, the value of the storage configuration to use for the pgbackrest shared repository deployment created when a user specifies pgbackrest to be enabled on a cluster
+|BackrestStorage    |required, the value of the storage configuration to use for the pgBackRest repository.
+|BackupStorage    |required, the value of the storage configuration to use for backups generated by `pg_dump`.
 |WALStorage        | optional, the value of the storage configuration to use for PostgreSQL Write Ahead Log
 |StorageClass        | optional, for a dynamic storage type, you can specify the storage class used for storage provisioning (e.g. standard, gold, fast)
 |AccessMode        |the access mode for new PVCs (e.g. ReadWriteMany, ReadWriteOnce, ReadOnlyMany). See below for descriptions of these.

docs/content/installation/configuration.md

@@ -135,8 +135,8 @@ other storage classes in production deployments.
 
 | Name | Default | Required | Description |
 |------|---------|----------|-------------|
-| `backrest_storage` | hostpathstorage | **Required** | Set the value of the storage configuration to use for the pgbackrest shared repository deployment created when a user specifies pgbackrest to be enabled on a cluster. |
-| `backup_storage` | hostpathstorage | **Required** | Set the value of the storage configuration to use for backups, including the storage for pgbackrest repo volumes. |
+| `backrest_storage` | hostpathstorage | **Required** | Set the value of the storage configuration to use for the pgBackRest repository. |
+| `backup_storage` | hostpathstorage | **Required** | required, the value of the storage configuration to use for backups generated by `pg_dump`. |
 | `primary_storage` | hostpathstorage | **Required** | Set to configure which storage definition to use when creating volumes used by PostgreSQL primaries on all newly created clusters. |
 | `replica_storage` | hostpathstorage | **Required** | Set to configure which storage definition to use when creating volumes used by PostgreSQL replicas on all newly created clusters. |
 | `wal_storage` |  |  | Set to configure which storage definition to use when creating volumes used for PostgreSQL Write-Ahead Log. |