fix link to ncml and remove link to developer's guide
fix link to ncml and remove link to developer's guide

Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java