r/vsphere_virtual_machine: Small doc correction for hostname

Just a small grammar fix, and also re-run the sample code through
terraform fmt.

website/docs/r/virtual_machine.html.markdown

@@ -34,7 +34,7 @@ resource "vsphere_virtual_machine" "web" {
 ```hcl
 resource "vsphere_virtual_machine" "lb" {
   name          = "lb01"
-  hostname	= "lbalancer01"
+  hostname      = "lbalancer01"
   folder        = "Loadbalancers"
   vcpu          = 2
   memory        = 4096
@@ -65,7 +65,7 @@ The following arguments are supported:
 * `folder` - (Optional) The folder to group the VM in.
 * `vcpu` - (Required) The number of virtual CPUs to allocate to the virtual machine
 * `memory` - (Required) The amount of RAM (in MB) to allocate to the virtual machine
-* `hostname` - (Optional) The virtual machine hostname used during the OS customization - if not specified then `name` will be a hostname
+* `hostname` - (Optional) The virtual machine hostname used during the OS customization. Defaults to the `name` attribute.
 * `memory_reservation` - (Optional) The amount of RAM (in MB) to reserve physical memory resource; defaults to 0 (means not to reserve)
 * `datacenter` - (Optional) The name of a Datacenter in which to launch the virtual machine
 * `cluster` - (Optional) Name of a Cluster in which to launch the virtual machine