[migration] explicit first step of 3.10.9 migration.
Previously there was on a "commit now" confirmation.
The reason of the request are now explained and both request must be confirmed.
#! /bin/sh -e#if [ "$1" = remove -o "$1" = upgrade ]; then if which install-docs >/dev/null 2>&1; then install-docs -r cubicweb-doc fifi#DEBHELPER#exit 0