Update toc.yml (SharePoint#4460)

New addition to TOC, for Export API (Asynchronous Metadata Read API)

Author: JoanneHendrickson

docs/toc.yml

@@ -339,17 +339,21 @@
         href: apis/migration-isv-guidance.md
       - name: Migration API
         items:
-        - name: Import Migration API (CreateMigrationjob)
-          href: apis/migration-api-overview.md
+        - name: Import Migration API     
           items:
-          - name: Sharing
-            href: apis/migration-api-shared.md  
-          - name: Migrate web parts using the Migration API
-            href: apis/migrate-webparts-with-migrationAPI
+          - name: Import Migration API (CreateMigrationJob)
+            href: apis/migration-api-overview.md
+            items:
+            - name: Sharing
+              href: apis/migration-api-shared.md  
+            - name: Migrate web parts using the Migration API
+              href: apis/migrate-webparts-with-migrationapi.md
+        - name: Export Migration API (Asynchronous Metadata Read)         
+          href: apis/export-amr-api.md        
         - name: Azure container and queue
           href: apis/migration-api-azure-container-and-queue.md
         - name: Encryption
-          href: apis/migration-api-encryption.md         
+          href: apis/migration-api-encryption.md       
   - name: Site design
     href: declarative-customization/site-design-overview.md
     items: