Fix indentation of numbered lists

docs/dev/overlay-dev-guide.rst

@@ -21,11 +21,9 @@ an overlay widget instead:
    viewscreen to continue processing uninterrupted and keybindings bound to
    that viewscreen will continue to function. This was previously only
    achievable by C++ plugins.
-
 #. You'll get a free UI for enabling/disabling your widget and repositioning it
    on the screen. Widget state is saved for you and is automatically restored
    when the game is restarted.
-
 #. You don't have to manage the C++ interposing logic yourself and can focus on
    the business logic, writing purely in Lua if desired.