[PATCH] docs/devel/qom.rst: Correct code style

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Per commit 067109a11c ("docs/devel: mention the spacing requirement
for QOM"):

  For a storage structure the first declaration should always be
  called “parent_obj” and for a class structure the first member
  should always be called “parent_class”

Adapt the QOM rST document accordingly.

Reported-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 docs/devel/qom.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/devel/qom.rst b/docs/devel/qom.rst
index c9237950d0..2828843058 100644
--- a/docs/devel/qom.rst
+++ b/docs/devel/qom.rst
@@ -26,7 +26,7 @@ features:
    typedef DeviceClass MyDeviceClass;
    typedef struct MyDevice
    {
-       DeviceState parent;
+       DeviceState parent_obj;
 
        int reg0, reg1, reg2;
    } MyDevice;
@@ -147,7 +147,7 @@ will also have a wrapper function to call it easily:
 
    typedef struct MyDeviceClass
    {
-       DeviceClass parent;
+       DeviceClass parent_class;
 
        void (*frobnicate) (MyDevice *obj);
    } MyDeviceClass;
-- 
2.38.1