/usr/share/man/man1/mpiCC.mpich.1.gz is in libmpich1.0-dev 1.2.7-10ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/../../../lib/mpich/man/man1/mpiCC.1.gz
/usr/share/man/man1/../../../lib/mpich/man/man1/mpiCC.1.gz