posix-timers: Comment SIGEV_THREAD_ID properly

Replace the word salad.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230425183313.672220780@linutronix.de

kernel/time/posix-timers.c

@@ -53,10 +53,7 @@ static const struct k_clock * const posix_clocks[];
 static const struct k_clock *clockid_to_kclock(const clockid_t id);
 static const struct k_clock clock_realtime, clock_monotonic;
 
-/*
- * we assume that the new SIGEV_THREAD_ID shares no bits with the other
- * SIGEV values.  Here we put out an error if this assumption fails.
- */
+/* SIGEV_THREAD_ID cannot share a bit with the other SIGEV values. */
 #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \
 			~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD))
 #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!"