http://cgit.freedesktop.org/systemd/systemd/commit/?id=c1405e4f313768519d66f4...
author Lennart Poettering <lennart@poettering.net> 2014-10-24 10:02:44 (GMT)
man: avoid gendered singular pronouns
Using «their» as pronoun in these places is confusing since it is more associated with plural rather than singular, and the sentence already contains a plural. The word «her/his» apparently offends some people, hence let's avoid the problem altogether and just name the noun again.