Update get-serial-port-output.md - #1200

✓ 21:52:52.507Z  Clone repository  +16s
  ├─ ✓ 21:52:52.511Z  Update reference repository  +3s
  └─ ✓ 21:52:55.872Z  Checkout repository  +13s
ℹ 21:53:09.410Z  YFM version equals 5.43.3.
✓ 21:53:11.061Z  YFM: Public check — done  +8m 48s
  ├─ ✓ 21:53:11.063Z  Validation  +6m 50s
  │  ├─ ℹ 22:00:01.460Z  Warnings: 0 Errors: 0
  │  └─ ℹ 22:00:01.550Z  Validate log: https://server-yfm-preview.website.yandexcloud.net/d-32b1f7cb-1ed0-4ca2-87e2-fa699f4ae785/validate.combined.log
  └─ ✓ 22:00:01.550Z  Upload to storage  +1m 58s
✓ 22:01:59.722Z  Cleanup finished  +4s