SDL: Document SDL_HINT_RENDER_LINE_METHOD in the release notes

From 9f1e609aa0424131437e13806609a45ae66c71f8 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sat, 8 Jan 2022 12:42:36 -0800
Subject: [PATCH] Document SDL_HINT_RENDER_LINE_METHOD in the release notes

 WhatsNew.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/WhatsNew.txt b/WhatsNew.txt
index f1b88b1ced7..92225431508 100644
--- a/WhatsNew.txt
+++ b/WhatsNew.txt
@@ -8,6 +8,7 @@ This is a list of major changes in SDL's version history.
 * SDL_RenderGeometryRaw() takes a pointer to SDL_Color, not int. You can cast color data in SDL_PIXELFORMAT_RGBA32 format (SDL_PIXELFORMAT_ABGR8888 on little endian systems) for this parameter.
 * Improved accuracy of horizontal and vertical line drawing when using OpenGL or OpenGLES
+* Added the hint SDL_HINT_RENDER_LINE_METHOD to control the method of line drawing used, to select speed, correctness, and compatibility.
 * Fixed size of custom cursors