update docs

docs/activation.md

@@ -41,7 +41,7 @@ The username of the initial admin user should always be `root`.
 You must define at least one cloud provider for each of these categories:
   * DNS (Amazon Route53 or GoDaddy DNS)
   * Email (SMTP, SendGrid or Mailgun)
-  * Compute (Vultr, DigitalOcean)
+  * Compute (Vultr or DigitalOcean)
     * Note: Amazon EC2 support is incomplete, do not use for now
 
 ### Initial Domain