[book] typos / clarifications in create-instance section Clarify that cubicweb-ctl upgrade needs to be run whenever cubicweb or a cube is upgraded. Related to #2632425.

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#! /bin/sh -e

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case "$1" in

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    purge)

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	rm -rf /etc/cubicweb.d/

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	rm -rf /var/log/cubicweb/

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	rm -rf /var/lib/cubicweb/

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    ;;

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esac

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#DEBHELPER#

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exit 0