SDL: Sync SDL3 wiki -> header (e300b)

SDL Commits
1 
From e300b87e358f9a255c28193d28b40f69df998936 Mon Sep 17 00:00:00 2001
From: SDL Wiki Bot <[EMAIL REDACTED]>
Date: Tue, 23 Jun 2026 07:25:14 +0000
Subject: [PATCH] Sync SDL3 wiki -> header

[ci skip]
---
 include/SDL3/SDL_system.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/SDL3/SDL_system.h b/include/SDL3/SDL_system.h
index 24f7d85bb89b6..9e889df523ecd 100644
--- a/include/SDL3/SDL_system.h
+++ b/include/SDL3/SDL_system.h
@@ -626,6 +626,8 @@ extern SDL_DECLSPEC bool SDLCALL SDL_SendAndroidMessage(Uint32 command, int para
  * \threadsafety It is safe to call this function from any thread.
  *
  * \since This function is available since SDL 3.6.0.
+ *
+ * \sa SDL_IsTablet
  */
 extern SDL_DECLSPEC bool SDLCALL SDL_IsPhone(void);