meta: loop userland-migrations in deprecations

Author: legendecas

.github/CODEOWNERS

@@ -229,3 +229,6 @@
 /lib/path.js @nodejs/path
 /lib/path/* @nodejs/path
 /test/parallel/test-path-* @nodejs/path
+
+# userland-migrations
+/doc/api/deprecations.md @nodejs/userland-migrations