[PATCH 1/2] doc: Clarify serial parameters

[Axel Heider]

There is a difference between 'null' and 'none'. Add a sentence to
highlight this, so this does not get mixed up.

Signed-off-by: Axel Heider <axelheider@gmx.de>
---
 qemu-options.hx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index 83aa59a920..e3f256fa72 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3702,7 +3702,8 @@ SRST
         [Linux only] Pseudo TTY (a new PTY is automatically allocated)

     ``none``
-        No device is allocated.
+        No serial devices are allocated at all. Use ``null`` to disable a
+        specific serial device.

     ``null``
         void device
--
2.17.1