Documentation updates for gnt-node
Documentation updates for gnt-node

The patch also adds a 'return 0' to a function that was missing it.

Reviewed-by: imsnah


ganeti/ganeti,yiannist/ganeti,ganeti/ganeti,leshchevds/ganeti,yiannist/ganeti,mbakke/ganeti,dimara/ganeti,mbakke/ganeti,apyrgio/snf-ganeti,andir/ganeti,mbakke/ganeti,ganeti-github-testing/ganeti-test-1,andir/ganeti,dimara/ganeti,apyrgio/ganeti,ganeti/ganeti,leshchevds/ganeti,bitemyapp/ganeti,apyrgio/snf-ganeti,bitemyapp/ganeti,grnet/snf-ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,grnet/snf-ganeti,onponomarev/ganeti,leshchevds/ganeti,andir/ganeti,yiannist/ganeti,onponomarev/ganeti