DEVDOCS-6097:[update] add "Aftership" (#565)

<!-- Ticket number or summary of work -->
# [DEVDOCS-6097]


## What changed?
Added "Aftership"

## Release notes draft
<!-- Provide an entry for the release notes using simple, conversational
language. Don't be too technical. Explain how the change will benefit
the merchant and link to the feature.

Examples:
* The newly-released [X feature] is now available to use. Now, you’ll be
able to [perform Y action].
* We're happy to announce [X feature], which can help you [perform Y
action].
* [X feature] helps you to create [Y response] using the [Z query
parameter]. Now, you can deliver [ex, localized shopping experiences for
your customers].
* Fixed a bug in the [X endpoint]. Now the [Y field] will appear when
you click [Z option]. -->
* 

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

ping {names}


[DEVDOCS-6097]:
https://bigcommercecloud.atlassian.net/browse/DEVDOCS-6097?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

reference/orders.v2.oas2.yml

@@ -632,9 +632,9 @@ paths:
 
         There are three methods for generating a tracking link for a shipment:
 
-        1. Use `shipping_provider` and `tracking_number`: This generates an automatic tracking link that you can click from the BigCommerce control panel and customer-facing emails. The `generated_tracking_link` property in the API response represents this tracking link. The `tracking_link` property in the API response will remain empty.
+        1. Use `shipping_provider` and `tracking_number`: This generates a link to one of our integrated providers that you can click from the BigCommerce control panel and customer-facing emails. If a merchant still needs to set up a shipping provider or if the provider is not one of our natively integrated providers, you will click on an Aftership tracking link instead. The `generated_tracking_link` property in the API response represents one of these tracking links. The `tracking_link` property in the API response will remain empty.
 
-        2. Use `tracking_carrier` and `tracking_number`: This also creates an automatic tracking link that you can click in both the BigCommerce control panel and customer-facing emails. Like the previous method, the `generated_tracking_link` property in the API response represents this tracking link. The `tracking_link` property in the API response will remain empty.
+        2. Use `tracking_carrier` and `tracking_number`: This also creates a link to one of our integrated providers or an Aftership tracking link that you can click in both the BigCommerce control panel and customer-facing emails. Like the previous method, the `generated_tracking_link` property in the API response represents this tracking link. The `tracking_link` property in the API response will remain empty.
 
         3. Supply a custom `tracking_link`: By providing a value for the `tracking_link` property, you can use your own tracking link within the BigCommerce control panel and in customer-facing emails. The API response will return your supplied tracking link as part of the `tracking_link` property in the response. In situations when there isn't a `generated_tracking_link`, the property in the API response will remain empty. 
         
@@ -3258,7 +3258,7 @@ components:
           example: ""
         tracking_link:
           type: string
-          description: The custom tracking link supplied on POST or PUT shipments. For the auto-generated tracking link see the `generated_tracking_link` property.
+          description: The custom tracking link supplied on POST or PUT shipments. For the link to one of our integrated providers or Aftership tracking link, see the `generated_tracking_link` property.
         comments:
           type: string
           description: Comments the shipper wishes to add.
@@ -3289,7 +3289,7 @@ components:
           readOnly: true
         generated_tracking_link:
           type: string
-          description: The tracking link that is generated using the combination of either the `tracking_number` and `shipping_provider` or `tracking_number` and `tracking_carrier`. This will be empty if the custom `tracking_link` value is provided.
+          description: The link to one of our integrated providers or Aftership tracking link that is generated using the combination of either the `tracking_number` and `shipping_provider` or `tracking_number` and `tracking_carrier`. This will be empty if the custom `tracking_link` value is provided.
       x-internal: false
     orderConsignments_Resource:
       title: orderConsignments_Resource
@@ -3631,7 +3631,7 @@ components:
           maxLength: 50
         tracking_link:
           type: string
-          description: The custom tracking link supplied on POST or PUT shipments. For the auto-generated tracking link see the `generated_tracking_link` property.
+          description: The custom tracking link supplied on POST or PUT shipments. For the link to one of our integrated providers or Aftership tracking link see the `generated_tracking_link` property.
           example: https://www.mycustomtrackinglink.com/tracking
           maxLength: 500
         merchant_shipping_cost: 
@@ -3707,7 +3707,7 @@ components:
           example: ""
         tracking_link:
           type: string
-          description: The custom tracking link supplied on POST or PUT shipments. For the auto-generated tracking link see the `generated_tracking_link` property.
+          description: The custom tracking link supplied on POST or PUT shipments. For the link to one of our integrated providers or Aftership tracking link see the `generated_tracking_link` property.
           example: https://www.mycustomtrackinglink.com/tracking
           maxLength: 500
         comments: