These devices had been removed/replaced in QEMU v2.12 and v4.0.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 docs/about/removed-features.rst | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst
index 568a2c725b..ffb82c4a99 100644
--- a/docs/about/removed-features.rst
+++ b/docs/about/removed-features.rst
@@ -510,6 +510,17 @@ running the old binaries, you can use older versions of QEMU.
 System emulator devices
 -----------------------
 
+``spapr-pci-vfio-host-bridge`` (removed in 2.12)
+'''''''''''''''''''''''''''''''''''''''''''''''''
+
+The ``spapr-pci-vfio-host-bridge`` device type has been replaced by the
+``spapr-pci-host-bridge`` device type.
+
+``ivshmem`` (removed in 4.0)
+''''''''''''''''''''''''''''
+
+Replaced by either the ``ivshmem-plain`` or ``ivshmem-doorbell``.
+
 ``ide-drive`` (removed in 6.0)
 ''''''''''''''''''''''''''''''
 
-- 
2.27.0