CFY-650 added doc comments for Task's on_success and on_failure handlers parameters
CFY-650 added doc comments for Task's on_success and on_failure handlers parameters

isaac-s/cloudify-plugins-common,codilime/cloudify-plugins-common,isaac-s/cloudify-plugins-common,codilime/cloudify-plugins-common,isaac-s/cloudify-plugins-common,cloudify-cosmo/cloudify-plugins-common,cloudify-cosmo/cloudify-plugins-common,cloudify-cosmo/cloudify-plugins-common,xdegenne/cloudify-plugins-common,geokala/cloudify-plugins-common,codilime/cloudify-plugins-common