Docs: update ModemManager recommendation (#9328)

Instead of modifying the service file provided by the distro,
use drop-in functionaly to explicitly specify the policy.
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Erovia 2020-07-07 19:22:38 +01:00 committed by GitHub
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@ -53,7 +53,7 @@ SUBSYSTEMS=="usb", ATTRS{idVendor}=="1b4f", ATTRS{idProduct}=="9203", TAG+="uacc
**Note:** With older (before 1.12) ModemManager, filtering only works when not in strict mode, the following commands can update that settings:
```console
sudo sed -i 's/--filter-policy=strict/--filter-policy=default/' /lib/systemd/system/ModemManager.service
printf '[Service]\nExecStart=\nExecStart=/usr/sbin/ModemManager --filter-policy=default' | sudo tee /etc/systemd/system/ModemManager.service.d/policy.conf
sudo systemctl daemon-reload
sudo systemctl restart ModemManager
```