fix document misses in network/cgi.rst.
fix document misses in network/cgi.rst.

the method for run_server should be `run', not `start'.

pfi/pficommon,pfi/pficommon,takei-yuya/pficommon,takei-yuya/pficommon,retrieva/pficommon,pfi/pficommon,pfi/pficommon,retrieva/pficommon,takei-yuya/pficommon,retrieva/pficommon,retrieva/pficommon,takei-yuya/pficommon,retrieva/pficommon