SDL: .wikiheaders-options: Add a warning that SDL3 is WIP.

From b33000448e8e21fcc5ae9c262618293e54d69ae9 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Tue, 22 Nov 2022 13:48:45 -0500
Subject: [PATCH] .wikiheaders-options: Add a warning that SDL3 is WIP.

---
 .wikiheaders-options | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.wikiheaders-options b/.wikiheaders-options
index 79dcb8d3c302..294da2d3eeda 100644
--- a/.wikiheaders-options
+++ b/.wikiheaders-options
@@ -13,3 +13,4 @@ projecturl = https://libsdl.org/
 wikiurl = https://wiki.libsdl.org
 bugreporturl = https://github.com/libsdl-org/sdlwiki/issues/new
 warn_about_missing = 0
+wikipreamble = (This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)