Fix command line option from 'scene' to '--scene'

tutorials/editor/command_line_tutorial.rst

@@ -86,7 +86,7 @@ given build type.
 +------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``--path <directory>``                   | |release| Path to a project (``<directory>`` must contain a 'project.godot' file).                                                                           |
 +------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| ``scene <path>``                         | |release| Path or UID of a scene in the project that should be started.                                                                                      |
+| ``--scene <path>``                       | |release| Path or UID of a scene in the project that should be started.                                                                                      |
 +------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``-u``, ``--upwards``                    | |release| Scan folders upwards for 'project.godot' file.                                                                                                     |
 +------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------+