Updates to billing FAQs (#3911)

## What are you changing in this pull request and why?
Updating the billing page to include ephemeral modes 
Updating FAQs to reflect that billing is based on seats and usage

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.
- [x] Add a checklist item for anything that needs to happen before this
PR is merged, such as "needs technical review" or "change base branch."

website/docs/docs/cloud/billing.md

@@ -15,7 +15,7 @@ As a customer, you pay for the number of seats you have and the amount of usage
 
 dbt Cloud considers a Successful Model Built as any model that is successfully built via a run through dbt Cloud’s orchestration functionality in a dbt Cloud deployment environment. Models are counted when built and run. This includes any jobs run via dbt Cloud's scheduler, CI builds (jobs triggered by pull requests), runs kicked off via the dbt Cloud API, and any successor dbt Cloud tools with similar functionality. This also includes models that are successfully built even when a run may fail to complete. For example, you may have a job that contains 100 models and on one of its runs, 51 models are successfully built and then the job fails. In this situation, only 51 models would be counted.
 
-Any models built in a dbt Cloud development environment (for example, via the IDE) do not count towards your usage. Tests, seeds, and snapshots also do not count. 
+Any models built in a dbt Cloud development environment (for example, via the IDE) do not count towards your usage. Tests, seeds, ephemeral models, and snapshots also do not count. 
 
 
 ### What counts as a seat license? 

website/docs/faqs/Accounts/cloud-upgrade-instructions.md

@@ -38,7 +38,7 @@ To unlock your account and select a plan, review the following guidance per plan
 2. To unlock your account and continue using the Team plan, you need to enter your payment details. 
 3. Go to **Payment Information** and click **Edit** on the right.
 4. Enter your payment details and click **Save**.
-5.  This automatically unlocks your dbt Cloud account, and you can now enjoy the benefits of the Team plan. 🎉
+5. This automatically unlocks your dbt Cloud account, and you can now enjoy the benefits of the Team plan. 🎉
 
 <Lightbox src="/img/docs/dbt-cloud/trial-team-flow.gif"/>
 
@@ -59,7 +59,7 @@ For commonly asked billings questions, refer to the dbt Cloud [pricing page](htt
 <details>
   <summary>How does billing work?</summary>
   <div>
-    <div>Team plans are billed monthly on the credit card used to sign up, based on <a href="https://www.getdbt.com/pricing/">developer seat count</a>. You’ll also be sent a monthly receipt to the billing email of your choice. You can change any billing information in your <b>Account Settings</b> -> <b>Billing page</b>. <br></br><br></br>
+    <div>Team plans are billed monthly on the credit card used to sign up, based on [developer seat count and usage](/docs/cloud/billing). You’ll also be sent a monthly receipt to the billing email of your choice. You can change any billing information in your <b>Account Settings</b> > <b>Billing page</b>. <br></br><br></br>
 
     Enterprise plan customers are billed annually based on the number of developer seats, as well as any additional services + features in your chosen plan. </div>
     </div>
@@ -75,7 +75,7 @@ For commonly asked billings questions, refer to the dbt Cloud [pricing page](htt
 <details>
   <summary>Can I pay by invoice?</summary>
     <div>
-      <div>At present, dbt Cloud Team plan payments must be made via credit card, and by default they will be billed monthly based on the number of developer seats. <br></br><br></br>
+      <div>Currently, dbt Cloud Team plan payments must be made with a credit card, and by default they will be billed monthly based on the number of [developer seats and usage](/docs/cloud/billing). <br></br><br></br>
       
       We don’t have any plans to do invoicing for Team plan accounts in the near future, but we do currently support invoices for companies on the dbt Cloud Enterprise plan. Feel free to <a href="https://www.getdbt.com/contact/">contact</a> us to build your Enterprise pricing plan.</div> 
     </div> 

website/docs/faqs/Accounts/payment-accepted.md

@@ -5,6 +5,6 @@ sidebar_label: 'Can I pay invoice'
 id: payment-accepted
 ---
 
-Presently for Team plans, self-service dbt Cloud payments must be made via credit card and by default, they will be billed monthly based on the number of active developer seats.
+Currently for Team plans, self-service dbt Cloud payments must be made with a credit card and by default, they will be billed monthly based on the number of [active developer seats and usage](/docs/cloud/billing).
 
 We don't have any plans to do invoicing for self-service teams in the near future, but we *do* currently support invoices for companies on the **dbt Cloud Enterprise plan.** Feel free to [contact us](https://www.getdbt.com/contact) to build your Enterprise pricing.