Previously a link of the form [[.:know-how:]] resulted in the following
a) if the page was not yet there, a (red) link to the new namespace with the default suffix 'start' was inserted
b) if the namepage 'start' page exists, its title is shown
Behaviour in rc2020-06-01 "Hogfather"
a) no link at all is shown for new / non existing pages
b) existing namespaces are still correctly shown