SDL: mutex: Fixed typos in documentation

SDL Commits
1 
From 736f9fb9b9cb94d29ae77b5c29b5ac003463f5e1 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Wed, 26 Apr 2023 10:11:55 -0400
Subject: [PATCH] mutex: Fixed typos in documentation

---
 include/SDL3/SDL_mutex.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/SDL3/SDL_mutex.h b/include/SDL3/SDL_mutex.h
index 83183dbc3ca1..b242dd74e364 100644
--- a/include/SDL3/SDL_mutex.h
+++ b/include/SDL3/SDL_mutex.h
@@ -178,7 +178,7 @@ extern DECLSPEC int SDLCALL SDL_LockMutex(SDL_mutex * mutex) SDL_ACQUIRE(mutex);
  * Try to lock a mutex without blocking.
  *
  * This works just like SDL_LockMutex(), but if the mutex is not available,
- * this function returns `SDL_MUTEX_TIMEOUT` immediately.
+ * this function returns `SDL_MUTEX_TIMEDOUT` immediately.
  *
  * This technique is useful if you need exclusive access to a resource but
  * don't want to wait for it, and will return to it to try again later.