/usr/share/man/man1/mpiCC.openmpi.1.gz is in libopenmpi-dev 2.1.1-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/mpic++.openmpi.1.gz
/usr/share/man/man1/mpic++.openmpi.1.gz