DEVDOCS-6204 (#792)

Updated OAuth scopes descriptions table

<!-- Ticket number or summary of work -->
# [DEVDOCS-6204]


## What changed?
<!-- Provide a bulleted list in the present tense -->
* OAuth scopes descriptions table for Unified Billing has correct
language for names and purposes

## Release notes draft
* Updated description table to reflect standard language
* Updated scope names to correct current values
* Updated description of "create Checkouts" scope

## Anything else?
<!-- Add related PRs, salient notes, additional ticket numbers, etc. -->

ping {names}


[DEVDOCS-6204]:
https://bigcommercecloud.atlassian.net/browse/DEVDOCS-6204?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

docs/integrations/apps/unified-billing/index.mdx

@@ -20,11 +20,11 @@ For the full list of requirements and limitations, see our Help Center article [
 
 The following scopes pertain directly to Unified Partner Billing. For a complete list of generally available account-level OAuth scopes, see the [Guide to API Accounts](/api-docs/getting-started/api-accounts#account-resource-scopes).
 
-| UI Name | Permission | Parameter | Description | Resources |
+| UI Name | Scopes | Parameter | Description | Resources |
 |:--------|:-----------|:----------|:------------|:----------|
-| Subscriptions | modify | `account_subscriptions_cancel` | View or cancel account-level subscriptions | [GraphQL Account API](/docs/graphql-account/users-overview) |
-| Subscriptions | read-only | `account_subscriptions_read` | View account-level subscriptions | [GraphQL Account API](/docs/graphql-account/users-overview) |
-| Checkouts | modify | `account_checkouts_create` | View or cancel account-level checkouts | [GraphQL Account API](/docs/graphql-account/users-overview) |
+| Subscriptions | cancel | `account_subscriptions_cancel` | View or cancel account-level subscriptions | [GraphQL Account API](/docs/graphql-account/users-overview) |
+| Subscriptions | read | `account_subscriptions_read` | View account-level subscriptions | [GraphQL Account API](/docs/graphql-account/users-overview) |
+| Checkouts | modify | `account_checkouts_create` | Create account-level checkouts | [GraphQL Account API](/docs/graphql-account/users-overview) |
 | Checkouts | read-only | `account_checkouts_read` | View account-level checkouts | [GraphQL Account API](/docs/graphql-account/users-overview) |
 
 ### Gathering Information