[PATCH] news: Document the `role` attribute for shmem device

[Wang Xin]

Signed-off-by: Wang Xin <wangxinxin.wang at huawei.com>

diff --git a/NEWS.rst b/NEWS.rst
index 0669051ee6..be7274a184 100644
--- a/NEWS.rst
+++ b/NEWS.rst
@@ -13,6 +13,12 @@ v6.7.0 (unreleased)
 
 * **New features**
 
+  * shmem: Add support for shmem-{plain, doorbell} ``role`` option
+
+    The ``role`` attribute controls how the domain behaves on migration. With
+    ``role=master``, the guest will copy the shared memory on migration to
+    the destination host. With ``role=peer``, the migration is disabled.
+
 * **Improvements**
 
 * **Bug fixes**
-- 
2.26.0.windows.1