add azure westeurope (#844)

Author: fiquick

modules/ROOT/pages/managing-instances/regions.adoc

@@ -100,6 +100,7 @@ Aura supports the following regions based on your tier:
 ** `francecentral`
 ** `koreacentral`
 ** `uksouth`
+** `westeurope`
 ** `westus3`
 ======
 
@@ -122,6 +123,7 @@ Aura supports the following regions based on your tier:
 ** `francecentral`
 ** `koreacentral`
 ** `uksouth`
+** `westeurope`
 ** `westus3`
 ======