/usr/src/openvswitch-1.4.0/lib/unixctl-syn.man is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | .IP "Runtime management options:"
\fB\-\-unixctl=\fIsocket\fR
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