we switched to front-end/back-end, but newer patches
reintroduced old language. Fix this up.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 docs/interop/vhost-user.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst
index 73e710fe32..3c12607517 100644
--- a/docs/interop/vhost-user.rst
+++ b/docs/interop/vhost-user.rst
@@ -340,7 +340,7 @@ drivers cannot negotiate it.
 
 This reserved feature bit was reused by the vhost-user protocol to add
 vhost-user protocol feature negotiation in a backwards compatible
-fashion. Old vhost-user master and slave implementations continue to
+fashion. Old vhost-user front-end and back-end implementations continue to
 work even though they are not aware of vhost-user protocol feature
 negotiation.
 
-- 
MST