Update toc.yml

Author: engyebrahim

docs/navigate/devops-testing/toc.yml

@@ -63,6 +63,10 @@ items:
         items:
           - name: Overview
             href: ../../core/testing/unit-testing-mstest-intro.md
+          - name: Migration
+            items:
+              - name: Migrate-from-MSTest-V1-to-V3
+              - href: ../../core/testing/unit-testing-mstest-migration-from-v1-to-v3.md
           - name: Getting started
             items:
               - name: Overview