Add missing image parameter in documentation

Issue: [sc-14406]

Author: cbandy

docs/config.toml

@@ -35,6 +35,7 @@ imageCrunchyPGBackrestPrivate     = "registry.crunchydata.com/crunchydata/crunch
 imageCrunchyPGBouncer  = "registry.developers.crunchydata.com/crunchydata/crunchy-pgbouncer:ubi8-1.16-2"
 imageCrunchyExporter   = "registry.developers.crunchydata.com/crunchydata/crunchy-postgres-exporter:ubi8-5.1.0-0"
 imageCrunchyPGAdmin    = "registry.developers.crunchydata.com/crunchydata/crunchy-pgadmin4:ubi8-4.30-0"
+imageCrunchyPGUpgrade  = ""
 operatorRepository     = "registry.developers.crunchydata.com/crunchydata/postgres-operator"
 operatorRepositoryPrivate         = "registry.crunchydata.com/crunchydata/postgres-operator"
 postgresOperatorTag = "ubi8-5.1.0-0"