SDL: Sync SDL3 wiki -> header (7000a)

From 7000a112a320f8655318b161eebde3fc19c2bd0a Mon Sep 17 00:00:00 2001
From: SDL Wiki Bot <[EMAIL REDACTED]>
Date: Mon, 15 Apr 2024 21:13:12 +0000
Subject: [PATCH] Sync SDL3 wiki -> header

---
 include/SDL3/SDL_mouse.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/SDL3/SDL_mouse.h b/include/SDL3/SDL_mouse.h
index ada70ffe7396b..11bf354bf2a15 100644
--- a/include/SDL3/SDL_mouse.h
+++ b/include/SDL3/SDL_mouse.h
@@ -516,6 +516,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_CursorVisible(void);
  * - Button 1: Left mouse button
  * - Button 2: Middle mouse button
  * - Button 3: Right mouse button
+ * - Button 4: Side mouse button 1
+ * - Button 5: Side mouse button 2
  *
  * \since This macro is available since SDL 3.0.0.
  */