Replace links to decommissioned resources

[dshevtsov]

Purpose of this pull request

This pull request (PR) replace links to decommissioned resources with up-to-date links.

Affected pages

• https://developer.adobe.com/commerce/webapi//get-started/api-security/
• https://developer.adobe.com/commerce/webapi//graphql/schema/cart/mutations/set-payment-place-order/
• https://developer.adobe.com/commerce/webapi//graphql/schema/checkout/mutations/create-braintree-client-token/
• https://developer.adobe.com/commerce/webapi//graphql/schema/store/queries/dynamic-blocks/
• https://developer.adobe.com/commerce/webapi//graphql/tutorials/checkout/apply-coupon/
• https://developer.adobe.com/commerce/webapi//graphql/tutorials/checkout/
• https://developer.adobe.com/commerce/webapi//graphql/usage/caching/
• https://developer.adobe.com/commerce/webapi//graphql/usage/staging-queries/
• https://developer.adobe.com/commerce/webapi//rest/b2b/
• https://developer.adobe.com/commerce/webapi//rest/inventory/manage-source-items/
• https://developer.adobe.com/commerce/webapi//rest/modules/import/
• https://developer.adobe.com/commerce/webapi//rest/tutorials/
• https://developer.adobe.com/commerce/webapi//rest/tutorials/orders/