provider/triton: Change triton docs to reflect key_material not key_path (#6090)

website/source/docs/providers/triton/index.html.markdown

@@ -16,9 +16,9 @@ Use the navigation to the left to read about the available resources.
 
 ```
 provider "triton" {
-    account = "AccountName"
-    key_path = "~/.ssh/id_rsa"
-    key_id = "25:d4:a9:fe:ef:e6:c0:bf:b4:4b:4b:d4:a8:8f:01:0f"
+    account      = "AccountName"
+    key_material = "~/.ssh/id_rsa"
+    key_id       = "25:d4:a9:fe:ef:e6:c0:bf:b4:4b:4b:d4:a8:8f:01:0f"
 
     # If using a private installation of Triton, specify the URL
     url = "https://us-west-1.api.joyentcloud.com"
@@ -30,6 +30,6 @@ provider "triton" {
 The following arguments are supported in the `provider` block:
 
 * `account` - (Required) This is the name of the Triton account. It can also be provided via the `SDC_ACCOUNT` environment variable.
-* `key_path` - (Required) This is the path to the private key of an SSH key associated with the Triton account to be used.
+* `key_material` - (Required) This is the path to the private key of an SSH key associated with the Triton account to be used.
 * `key_id` - (Required) This is the fingerprint of the public key matching the key specified in `key_path`. It can be obtained via the command `ssh-keygen -l -E md5 -f /path/to/key`
 * `url` - (Optional) This is the URL to the Triton API endpoint. It is required if using a private installation of Triton. The default is to use the Joyent public cloud.