[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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#

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if [ "$1" = remove -o "$1" = upgrade ]; then

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  if which install-docs >/dev/null 2>&1; then

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    install-docs -r cubicweb-doc

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  fi

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fi

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#DEBHELPER#

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exit 0