Documentation for subnet

[XieGuochao]

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Description

Please add more documentations for the subnet submodule and variable.

[johnlane]

Just in case it helps anyone else passing here, saving you the time it took me to work this out.

  subnets                  = { "red": { cidr_block = "10.0.0.0/24",
			                dns_label = "red"
                                      },
                              "blue": { cidr_block = "10.0.1.0/24",
			                dns_label = "blue"
                                      }
                             }