provider/scaleway: Update provider docs with new attribute

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

@@ -25,6 +25,7 @@ Here is an example that will setup the following:
 provider "scaleway" {
   access_key = ""
   organization = ""
+  region = "par1"
 }
 
 resource "scaleway_ip" "ip" {
@@ -81,10 +82,15 @@ credentials in your configuration file, you can leave them
 out:
 
 ```
-provider "scaleway" {}
+provider "scaleway" {
+  organization = ""
+  access_key = ""
+  region = "par1"
+}
 ```
 
 ...and instead set these environment variables:
 
 - **SCALEWAY_ORGANIZATION**: Your Scaleway organization
 - **SCALEWAY_ACCESS_KEY**: Your API Access key
+- **SCALEWAY_REGION**: The Scaleway region