Design a title screen: change text to avoid use of first person (#4970)

getting_started/step_by_step/ui_main_menu.rst

@@ -201,7 +201,7 @@ containers split the area into two: a left and a right side or a top and
 a bottom side. They also allow the user to resize the left and right
 areas using an interactive bar. On the other hand, ``HBoxContainer``
 just splits itself into as many columns as it has children. Although you
-can deactivate the split container's resize behavior, I recommend to
+can deactivate the split container's resize behavior, it's recommended to
 favor box containers.
 
 Select the ``MarginContainer`` and add an ``HBoxContainer``. Then, we