Fix a typo in gnt-instance.sgml
Fix a typo in gnt-instance.sgml

Reviewed-by: imsnah


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