added documentation for "call" command to manual
added documentation for "call" command to manual

mcenirm/csvfix,mattgascoigne/csvfix,ausonweng/csvfix,ausonweng/csvfix,jheusser/csvfix,mcenirm/csvfix,mattgascoigne/csvfix,ausonweng/csvfix,mattgascoigne/csvfix,jheusser/csvfix,mcenirm/csvfix,jheusser/csvfix