Fixed typo

include/SDL3/SDL_error.h

@@ -45,7 +45,7 @@ extern "C" {
  * Calling this function will replace any previous error message that was set.
  *
  * This function always returns SDL_FALSE, since SDL frequently uses SDL_FALSE
- * to signify an failing result, leading to this idiom:
+ * to signify a failing result, leading to this idiom:
  *
  * ```c
  * if (error_code) {