SDL: include: Documented SDL_bool a little.

From e47f2956cf2e92c6c3e819b71548b29ad17097eb Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Thu, 11 Apr 2024 00:48:11 -0400
Subject: [PATCH] include: Documented SDL_bool a little.

---
 include/SDL3/SDL_stdinc.h | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/include/SDL3/SDL_stdinc.h b/include/SDL3/SDL_stdinc.h
index b8ef874902d3f..650989b8b47d9 100644
--- a/include/SDL3/SDL_stdinc.h
+++ b/include/SDL3/SDL_stdinc.h
@@ -136,10 +136,31 @@ void *alloca(size_t);
 /* @{ */
 
 /**
- * A boolean type.
+ * A boolean false.
+ *
+ * \since This macro is available since SDL 3.0.0.
+ *
+ * \sa SDL_bool
  */
 #define SDL_FALSE 0
+
+/**
+ * A boolean true.
+ *
+ * \since This macro is available since SDL 3.0.0.
+ *
+ * \sa SDL_bool
+ */
 #define SDL_TRUE 1
+
+/**
+ * A boolean type: true or false.
+ *
+ * \since This datatype is available since SDL 3.0.0.
+ *
+ * \sa SDL_TRUE
+ * \sa SDL_FALSE
+ */
 typedef int SDL_bool;
 
 /**