Log: fixed typo.

Scripted change:

$ grep -ril recevied src/ | xargs sed -i s/recevied/received/

Reported-by: <https://github.com/jeffdafoe>
Closes: <https://github.com/nginx/unit/issues/920>
Cc: <https://github.com/meezaan>
Cc: Timo Stark <t.stark@nginx.com>
Signed-off-by: Alejandro Colomar <alx@nginx.com>
Reviewed-by: Andrew Clayton <a.clayton@nginx.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

src/nxt_signal_handlers.c

@@ -31,7 +31,7 @@ const nxt_sig_event_t  nxt_process_signals[] = {
 static void
 nxt_signal_handler(nxt_task_t *task, void *obj, void *data)
 {
-    nxt_trace(task, "signal signo:%d (%s) recevied, ignored",
+    nxt_trace(task, "signal signo:%d (%s) received, ignored",
               (int) (uintptr_t) obj, data);
 }