chore: tweak the purchasable addons wording

Author: kibwashere

docusaurus/docs/cloud/getting-started/usage-billing.md

@@ -19,7 +19,7 @@ Strapi Cloud offers a free 14 days trial for all new accounts, and 3 paid plans:
 
 | Feature | Free Trial | Developer | Pro | Team |
 | --- | --- | --- | --- | --- |
-| **Seats** | 10 (up to 10 extra) | 1 (up to 3 extra) | 5 (up to 20 extra) | 10 (up to 50 extra) |
+| **Seats** | 10 | 1 (up to 3) | 5 (up to 20) | 10 (up to 50) |
 | **Database Entries**  | 1,000 | 1,000 | 100,000 | 1,000,000 |
 | **Assets Storage** | 5GB | 15GB | 150GB | 500GB |
 | **Assets Bandwidth** | 50GB | 50GB per month | 500GB per month | 1,000GB per month |
@@ -31,7 +31,7 @@ Strapi Cloud offers a free 14 days trial for all new accounts, and 3 paid plans:
 | **Content History** | 14 days retention | N/A | 14 days retention | 90 days retention |
 |  |  |  |  |  |
 | **Backups** | N/A | N/A | Weekly | Daily |
-| **Environments** | N/A | N/A | 0 included (up to 99 extra) | 1 included (up to 99 extra) |
+| **Environments** | 1 | 1 | 1 (up to 99) | 2 (up to 99) |
 
 :::strapi Additional information on usage and features
 - General features & usage: