Let's document the discrepancy between the Sec and USec suffixing of unit files and D-Bus properties at three places: in "systemctl show" (where it already was briefly mentioned), in the D-Bus interface description (at one place at least, i.e. the most prominent of properties that encapsulate time values, there are many more) and in the general man page explaining time values. By documenting this at all three places I think we now do as much as we can do about this highlighting the discrepancy of the naming and the reasons behind it. Fixes: #2047
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