Improve documentation - CUSTOMER_linux and windows

Improve usage report command in documentation.

Add sample request like

• ./qt-license-server export --fileName statisticsResults --url http://127.0.01:8080 --licenseNumber 11245270 --startDate 2024-01-01 --endDate 2025-01-01 --extension csv

```bash
./qt-license-server export --url <url of the running instance> --license <license number> --startDate <'YYYY-MM-DD'> --endDate <'YYYY-MM-DD'> —-extension <format of the export file (csv | xlsx)>
```
Here _ -license_ should be "-licenseNumber"