OCP 4.20 To add a DC to the installer

Author: alishaIBM

modules/installation-ibm-cloud-regions.adoc

@@ -53,6 +53,7 @@ ifdef::ibm-power-vs[]
 ** `eu-de-2`
 * `lon` (London, UK)
 ** `lon04`
+** `lon06`
 * `mad` (Madrid, Spain)
 ** `mad02`
 ** `mad04`