networking.hostId: fix cmd in description
1. Simplify the command by reading directly from /etc/machine-id which is already a random, lower-case hex string 2. Previously, the command output could be too short because of missing leading digits. This is now fixed.
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@ -341,7 +341,7 @@ in
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You should try to make this ID unique among your machines. You can
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generate a random 32-bit ID using the following commands:
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<literal>cksum /etc/machine-id | while read c rest; do printf "%x" $c; done</literal>
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<literal>head -c 8 /etc/machine-id</literal>
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(this derives it from the machine-id that systemd generates) or
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