Remove reference to requiring Enterprise tier for API key (#154)

Prospect thought they needed Enterprise Tier to use Terraform and referenced this doc. Since we changed our tiers this is no longer correct so submitting a PR for this.

docs/index.md

@@ -13,7 +13,7 @@ The Twingate provider can be used with [Twingate](https://www.twingate.com) to m
 
 ## Twingate Setup
 
-To use Twingate's Terraform provider, you need an API key, which requires the Enterprise tier. See our [documentation](https://docs.twingate.com/docs/api-overview) for more details about creating an API key. You will also need your network ID, or the prefix of your Twingate URL that you use to sign into the Admin Console. For example, if your URL is `autoco.twingate.com` your network ID is `autoco`.
+You need an API key to use Twingate's Terraform provider. See our [documentation](https://docs.twingate.com/docs/api-overview) for more details about creating an API key. You will also need your network ID, or the prefix of your Twingate URL that you use to sign into the Admin Console. For example, if your URL is `autoco.twingate.com` your network ID is `autoco`.
 
 ## Guidance and documentation
 
@@ -45,4 +45,4 @@ You can find it in the Admin Console URL, for example:
 `autoco.twingate.com`, where `autoco` is your network ID
 Alternatively, this can be specified using the TWINGATE_NETWORK environment variable.
 - `url` (String) The default is 'twingate.com'
-This is optional and shouldn't be changed under normal circumstances.
+This is optional and shouldn't be changed under normal circumstances.