SDL: Document that the timer callback can potentially be called before the timer returns.

From 14667cc0a3c484ce40db3d04cd7574e50bf0f95d Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 27 May 2024 07:56:04 -0700
Subject: [PATCH] Document that the timer callback can potentially be called
 before the timer returns.

---
 include/SDL3/SDL_timer.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/SDL3/SDL_timer.h b/include/SDL3/SDL_timer.h
index 9bac551a599ec..5efecb34824d9 100644
--- a/include/SDL3/SDL_timer.h
+++ b/include/SDL3/SDL_timer.h
@@ -165,7 +165,7 @@ typedef Uint32 (SDLCALL *SDL_TimerCallback)(void *userdata, SDL_TimerID timerID,
  * timer interval. If the value returned from the callback is 0, the timer is
  * canceled.
  *
- * The callback is run on a separate thread.
+ * The callback is run on a separate thread, and for short timeouts can potentially be called before this function returns.
  *
  * Timers take into account the amount of time it took to execute the
  * callback. For example, if the callback took 250 ms to execute and returned
@@ -226,7 +226,7 @@ typedef Uint64 (SDLCALL *SDL_NSTimerCallback)(void *userdata, SDL_TimerID timerI
  * timer interval. If the value returned from the callback is 0, the timer is
  * canceled.
  *
- * The callback is run on a separate thread.
+ * The callback is run on a separate thread, and for short timeouts can potentially be called before this function returns.
  *
  * Timers take into account the amount of time it took to execute the
  * callback. For example, if the callback took 250 ns to execute and returned