Graduate migrations, projects, security fix API previews (github#21704)

content/rest/overview/api-previews.md

@@ -18,15 +18,6 @@ During the preview period, we may change some features based on developer feedba
 
 To access an API preview, you'll need to provide a custom [media type](/rest/overview/media-types) in the `Accept` header for your requests. Feature documentation for each preview specifies which custom media type to provide.
 
-{% ifversion fpt %}
-## Migrations
-
-Allows you to download repositories from your GitHub user or organization account to review, backup, and [migrate](/rest/reference/migrations) data to {% data variables.product.prodname_ghe_server %}.
-
-**Custom media type:** `wyandotte-preview`
-**Announced:** [2018-05-24](https://developer.github.com/changes/2018-05-24-user-migration-api/)
-{% endif %}
-
 ## Enhanced deployments
 
 Exercise greater control over [deployments](/rest/reference/repos#deployments) with more information and finer granularity.
@@ -58,13 +49,15 @@ Create, list, update, and delete environments for pre-receive hooks.
 **Announced:** [2015-07-29](/rest/reference/enterprise-admin#pre-receive-environments)
 {% endif %}
 
+{% ifversion ghes < 3.3 %}
 ## Projects
 
 Manage [projects](/rest/reference/projects).
 
 **Custom media type:** `inertia-preview`
 **Announced:** [2016-09-14](https://developer.github.com/changes/2016-09-14-projects-api/)
 **Update:** [2016-10-27](https://developer.github.com/changes/2016-10-27-changes-to-projects-api/)
+{% endif %}
 
 ## Commit search
 
@@ -204,15 +197,6 @@ You can use a new endpoint to [update a pull request branch](/rest/reference/pul
 **Custom media types:** `lydian-preview`
 **Announced:** [2019-05-29](https://developer.github.com/changes/2019-05-29-update-branch-api/)
 
-{% ifversion fpt %}
-## Enable or disable automated security fixes
-
-You can use a new set of endpoints to [enable and disable automated security fixes](/rest/reference/repos#enable-automated-security-fixes).
-
-**Custom media types:** `london-preview`
-**Announced:** [2019-06-04](https://developer.github.com/changes/2019-06-04-automated-security-fixes/)
-{% endif %}
-
 ## Create and use repository templates
 
 You can use a new endpoint to [Create a repository using a template](/rest/reference/repos#create-a-repository-using-a-template) and [Create a repository for the authenticated user](/rest/reference/repos#create-a-repository-for-the-authenticated-user) that is a template repository by setting the `is_template` parameter to `true`. [Get a repository](/rest/reference/repos#get-a-repository) to check whether it's set as a template repository using the `is_template` key.