Update migration-api-overview.md (SharePoint#4396)

Content update:  Updated title & metadata to reflect focus of API.

Author: JoanneHendrickson

docs/apis/migration-api-overview.md

@@ -1,13 +1,13 @@
 ---
-title: "SharePoint Online Migration API Overview"
+title: "SharePoint Online Import Migration API"
 ms.author: jhendr
 author: JoanneHendrickson
 manager: pamgreen
-ms.date: 6/20/2018
-description: "This document is to give more in depth Information about how to use the SPO Migration API."
+search.appverid: MET150
+description: "This document is to give more in depth information about how to use the SPO Migration API."
 localization_priority: Priority
 ---
-# SharePoint Online Migration API
+# SharePoint Import Migration API (CreationMigrationJob)
 
 ## API Documention