Add notes about systemd-hwdb subsystem docs#1979

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jimklimov wants to merge 2 commits intonetworkupstools:masterfrom jimklimov:issue-1342

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Commits on Jul 4, 2023

tools/nut-usbinfo.pl: add notes to scripts/upower/95-upower-hid.hwdb generator about systemd-hwdb subsystem docs [follow-up to networkupstools#1342 ]
jimklimov
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scripts/upower/95-upower-hid.hwdbadd notes about systemd-hwdb subsystem docs [follow-up to networkupstools#1342 ]
jimklimov
committed