src/Doc/Tutorial/document/build

minor performance tuning: proper Same.operation;
clarified modules;

#!/usr/bin/env bash

set -e

$ISABELLE_LUALATEX root
$ISABELLE_BIBTEX root
$ISABELLE_LUALATEX root
$ISABELLE_LUALATEX root
./isa-index root
$ISABELLE_LUALATEX root