Fix docs implying the SDL ports were still on SDL2

Author: HexDecimal

tcod/sdl/audio.py

@@ -1,4 +1,4 @@
-"""SDL2 audio playback and recording tools.
+"""SDL audio playback and recording tools.
 
 This module includes SDL's low-level audio API and a naive implementation of an SDL mixer.
 If you have experience with audio mixing then you might be better off writing your own mixer or

tcod/sdl/render.py

@@ -1,4 +1,4 @@
-"""SDL2 Rendering functionality.
+"""SDL Rendering functionality.
 
 .. versionadded:: 13.4
 """

tcod/sdl/video.py

@@ -1,4 +1,4 @@
-"""SDL2 Window and Display handling.
+"""SDL Window and Display handling.
 
 There are two main ways to access the SDL window.
 Either you can use this module to open a window yourself bypassing libtcod's context,
@@ -167,7 +167,7 @@ def __init__(self, pixels: ArrayLike) -> None:
 
 
 class Window:
-    """An SDL2 Window object.
+    """An SDL Window object.
 
     Created from :any:`tcod.sdl.video.new_window` when working with SDL directly.