Miscellaneous documentation fixes

Michał Kępień requested to merge michal/misc-doc-fixes into master

This MR attempts to correct the minor issues found while performing the QA process for %December 2019 (9.11.14, 9.14.9, 9.15.7) releases (see https://wiki.isc.org/bin/view/QA/BindQaResults_9_11_14).

@mnowak or @stephen: please take a look when you have a moment.

Edited by Michał Kępień

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