fix: fix error info start capitalized

Signed-off-by: zhangyue <zy675793960@yeah.net>

sys/oom_unix_test.go

@@ -103,7 +103,7 @@ func waitForPid(process *os.Process) (int, error) {
 	case pid := <-c:
 		return pid, nil
 	case <-time.After(10 * time.Second):
-		return 0, errors.New("Process did not start in 10 seconds")
+		return 0, errors.New("process did not start in 10 seconds")
 	}
 }