Fix installation instructions for *nix (GH-5605)


Remove pkg_add -r python from FreeBSD installation section.
Moved to OpenBSD.
(cherry picked from commit 3384d38d51a2c3450e742175db5d6d638fa5d2eb)

Co-authored-by: Eitan Adler <grimreaper@users.noreply.github.com>
1 file changed