Example rectification

[SunithaGudisagarIBM1]

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Relates OR Closes #4559

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[SunithaGudisagarIBM1]

resource "ibm_is_vpc" "example" {
  name = "example-vpc"
}

resource "ibm_is_subnet" "testacc_subnet1" {
  name            = "example-subnet"
  vpc             = ibm_is_vpc.example.id
  zone            = "us-south-1"
  ipv4_cidr_block = "10.240.0.0/24"
}

resource "ibm_is_vpn_gateway" "testacc_VPNGateway1" {
  name   = "example-gateway"
  subnet = ibm_is_subnet.testacc_subnet1.id
  mode   = "route"
}

resource "ibm_is_vpn_gateway_connection" "testacc_VPNGatewayConnection1" {
  name          = "example-gateway-connection"
  vpn_gateway   = ibm_is_vpn_gateway.testacc_VPNGateway1.id
  peer_address  = ibm_is_vpn_gateway.testacc_VPNGateway1.public_ip_address
  preshared_key = "VPNDemoPassword"
}

resource "ibm_is_vpc_routing_table" "example" {
  vpc                           = ibm_is_vpc.example.id
  name                          = "example-routing-table"
  route_direct_link_ingress     = false
  route_transit_gateway_ingress = false
  route_vpc_zone_ingress        = false
}

resource "ibm_is_vpc_routing_table_route" "example" {
  vpc           = ibm_is_vpc.example.id
  routing_table = ibm_is_vpc_routing_table.example.routing_table
  zone          = "us-south-1"
  name          = "custom-route-2"
  destination   = "192.168.4.0/24"
  action        = "deliver"
  // next_hop      = "10.240.0.0" //ibm_is_vpn_gateway_connection.example.gateway_connection // Example value "10.0.0.4" 
  next_hop = ibm_is_vpn_gateway_connection.testacc_VPNGatewayConnection1.gateway_connection 
}

[SunithaGudisagarIBM1]

Error Message with the old setup: