update(platform): trial limitations (#27)

Signed-off-by: Stacey Salamon <111294980+staceysalamon-aiven@users.noreply.github.com>

docs/platform/concepts/free-trial.md

@@ -2,40 +2,32 @@
 title: 30-day trials
 ---
 
-Aiven offers a free trial for 30 days to explore the platform, including the [Aiven Console](https://console.aiven.io/), [API](/docs/tools/api), [CLI](/docs/tools/cli), [Aiven Terraform provider](/docs/tools/terraform), and [Aiven Operator for Kubernetes](/docs/tools/kubernetes), and the [Aiven services](https://docs.aiven.io/). You don't need a credit card to sign up.
-
-If you create services on the
-[free plan](/docs/platform/concepts/free-plan), they will continue to run alongside your free 30-day trial
-without affecting your trial credits. Free plan services also continue
-running after the trial has expired.
+Aiven offers a free trial for 30 days to explore the platform - including the [Aiven Console](/docs/tools/aiven-console), [API](/docs/tools/api), [CLI](/docs/tools/cli), [Aiven Terraform provider](/docs/tools/terraform), and [Aiven Operator for Kubernetes](/docs/tools/kubernetes) - and the [Aiven services](/docs/products/services). You don't need a credit card to sign up.
 
 ## Trial features and limitations
 
-The trial credits can be used for any paid services and plan sizes as
-well functionality like virtual private cloud peering.
+Trial credits can be used for any paid services and plan sizes in any project. They can
+also be used for paid features like virtual private cloud peering.
 
 Trials include:
 
 -   Up to 10 VMs
 -   1 [Virtual Private Cloud (VPC)](/docs/platform/howto/manage-vpc-peering)
 -   Up to 10 VPC peering connections
 
-There are some limitations:
+If you create services on the [free plan](/docs/platform/concepts/free-plan), they will
+continue to run alongside your free 30-day trial without affecting your trial credits.
+Free plan services also continue running after the trial has expired.
 
 <!-- vale off -->
+There are some limitations:
 
--   You can only have one trial
--   Trials can only be started in your default project, which is created
-    when you sign up
--   Trial credits cannot be transferred to another project
--   You can't create new services if your remaining credits would be
-    spent too quickly
-
+-   You can only have one trial.
+-   Trial credits are added to a single
+    [billing group](/docs/platform/concepts/billing-groups). You cannot transfer them to
+    another billing group.
+-   You can't create new services if your remaining credits would be spent too quickly.
 <!-- vale on -->
 
-## Add a payment card
-
-To keep your services running after the trial period,
-[add a payment card](/docs/platform/howto/manage-payment-card). Without a payment card, services are automatically powered
-down after credits run out, but they can be powered on again after a
-card is added.
+Services are automatically powered down after the trial ends or your credits run out. To
+keep your services running, [add a payment card](/docs/platform/howto/manage-payment-card).