resize
When resizing a DO droplet, you can only increase the size not
descrease. If you try and go down in size, the API will return this
error:
```
* digitalocean_droplet.foobar: Error resizing droplet (17090364):
POST https://api.digitalocean.com/v2/droplets/17090364/actions:
422 Size can not decrease size of Droplet's disk image
```
The Terraform configuration syntax defines what arrays are.
Use the word array consistently throughout the documentation
instead of list.
The corresponding JSON datatype is called array as well, and
since the Terraform configuration syntax is interoperable with
JSON it makes sense to use the term array to describe them.
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