SDL: SDL_FLT_EPSILON: Updated documentation to be wikiheaders-friendly.

From 8af58b4becff7516dcb445ca5fa5edc64c80c7bc Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Sat, 8 Jun 2024 23:15:21 -0400
Subject: [PATCH] SDL_FLT_EPSILON: Updated documentation to be
 wikiheaders-friendly.

---
 include/SDL3/SDL_stdinc.h | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/include/SDL3/SDL_stdinc.h b/include/SDL3/SDL_stdinc.h
index 6dd9c43cbb598..63c8d2aea9cb1 100644
--- a/include/SDL3/SDL_stdinc.h
+++ b/include/SDL3/SDL_stdinc.h
@@ -279,12 +279,18 @@ typedef Sint64 SDL_Time;
  */
 /* @{ */
 
-/**
- * Epsilon constant, used for comparing floating-point numbers. Equals by default to platform-defined FLT_EPSILON, or 1.1920928955078125e-07F if that's not available.
- */
 #ifdef FLT_EPSILON
 #define SDL_FLT_EPSILON FLT_EPSILON
 #else
+
+/**
+ * Epsilon constant, used for comparing floating-point numbers.
+ *
+ * Equals by default to platform-defined `FLT_EPSILON`, or
+ * `1.1920928955078125e-07F` if that's not available.
+ *
+ * \since This macro is available since SDL 3.0.0.
+ */
 #define SDL_FLT_EPSILON 1.1920928955078125e-07F /* 0x0.000002p0 */
 #endif