[retro-gtk] core: Fix a documentation copypasta error

[Adrien Plazas <aplazas src gnome org>]

commit 3592fd2b099175a75586ca8543f0078024db28ff
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Dec 20 10:15:37 2020 +0100

    core: Fix a documentation copypasta error

 retro-runner/retro-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/retro-runner/retro-core.c b/retro-runner/retro-core.c
index ebe31a1..3dbc0fa 100644
--- a/retro-runner/retro-core.c
+++ b/retro-runner/retro-core.c
@@ -1238,7 +1238,7 @@ retro_core_get_support_no_game (RetroCore *self)
 /**
  * retro_core_set_support_no_game:
  * @self: a #RetroCore
- * @support_no_game: the save directory
+ * @support_no_game: whether the core supports running with no game
  *
  * Sets whether the core supports running with no game.
  */