Updated names per Azure requirements

Author: TomArcherMsft

quickstart/101-cosmos-db-azure-container-instance/aci.tf

@@ -1,13 +1,13 @@
 resource "azurerm_container_group" "vote_aci" {
-  name                = "vote_aci"
+  name                = "vote-aci"
   location            = azurerm_resource_group.rg.location
   resource_group_name = azurerm_resource_group.rg.name
   ip_address_type     = "public"
-  dns_name_label      = "vote_aci"
+  dns_name_label      = "vote-aci-${random_integer.ri.result}"
   os_type             = "linux"
 
   container {
-    name   = "vote_aci"
+    name   = "vote-aci"
     image  = "mcr.microsoft.com/azuredocs/azure-vote-front:cosmosdb"
     cpu    = "0.5"
     memory = "1.5"