Apply suggestions from review

Co-authored-by: Chris <github.account@chrigel.net>
Signed-off-by: Gabriel Mainberger <gabriel.mainberger@vshn.net>

docs/modules/ROOT/pages/how-tos/application-aware-backups.adoc

@@ -31,7 +31,7 @@ But it should work with any command that has the ability to output the backup to
 
 == PostgreSQL
 
-PostgreSQL ship with the utility `pg_dump`.
+Note that the PostgreSQL image used requires the utility `pg_dump`.
 It is able to dump the database content into an SQL stream in a consistent state.
 The parameter `-- clean` ensures all tables including data are purged before, so a restore to an already populated DB does work.
 
@@ -45,5 +45,10 @@ template:
     annotations:
       k8up.io/backupcommand: sh -c 'PGDATABASE="$POSTGRES_DB" PGUSER="$POSTGRES_USER" PGPASSWORD="$POSTGRES_PASSWORD" pg_dump --clean'
       k8up.io/file-extension: .sql
+  spec:
+    containers:
+      - name: postgres
+        image: docker.io/bitnami/postgresql:11
+        ...
 <SNIP>
 ----