doc: Fix typo in DM parameters
Address comment in PR
@@ -478,7 +478,7 @@ arguments used for configuration. Here is a table describing these emulated dev
- Virtio GPU type device, parameters format is:
``virtio-gpu[,geometry=<width>x<height>+<x_off>+<y_off> | fullscreen]``
- * ``<geometry>`` specifies the mode of virtual display, windowed or fullscreen.
+ * ``geometry`` specifies the mode of virtual display, windowed or fullscreen.
If it is not set, the virtual display will use 1280x720 resolution in windowed mode.
* ``width`` specifies the width of the virtual display window in pixels.
* ``height`` specifies the height of the virtual display window in pixels.
