render: SDL_HINT_RENDER_DRIVER now accepts a comma-separated list.

Fixes #11077.

include/SDL3/SDL_hints.h

@@ -2900,6 +2900,10 @@ extern "C" {
  * - "gpu"
  * - "software"
  *
+ * This hint accepts a comma-separated list of driver names, and each will
+ * be tried in the order listed when creating a renderer until one succeeds
+ * or all of them fail.
+ *
  * The default varies by platform, but it's the first one in the list that is
  * available on the current platform.
  *
@@ -3289,6 +3293,10 @@ extern "C" {
  * force a specific target, such as "x11" if, say, you are on Wayland but want
  * to try talking to the X server instead.
  *
+ * This hint accepts a comma-separated list of driver names, and each will
+ * be tried in the order listed during init, until one succeeds or all of them
+ * fail.
+ *
  * This hint should be set before SDL is initialized.
  *
  * \since This hint is available since SDL 3.1.3.

include/SDL3/SDL_render.h

@@ -219,6 +219,9 @@ extern SDL_DECLSPEC bool SDLCALL SDL_CreateWindowAndRenderer(const char *title,
  * don't need a specific renderer, specify NULL and SDL will attempt to choose
  * the best option for you, based on what is available on the user's system.
  *
+ * If `name` is a comma-separated list, SDL will try each name, in the order
+ * listed, until one succeeds or all of them fail.
+ *
  * By default the rendering size matches the window size in pixels, but you
  * can call SDL_SetRenderLogicalPresentation() to change the content size and
  * scaling options.