minor fixes in H13 (caption Fig.13.3, Voorbeeld 13.2)

Author: hugoquene

KMS-NL.log

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+This is XeTeX, Version 3.14159265-2.6-0.999992 (TeX Live 2020) (preloaded format=xelatex 2020.9.28)  21 OCT 2020 09:33
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