Viacheslav Hletenko 6414b4db09 Add system update-check example
Add an example of online checking for updates
```
set system update-check auto-check
set system update-check url <url>
```

(cherry picked from commit fd3073eef7bcbd64112e0581ba10afb58100b30d)
2023-12-26 12:21:19 +00:00
..
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