0.92.x - Fix link for FAQ entry on DPI change
This fixes the link which should point at a FAQ entry describing the reasons for the DPI change and how the different scaling options are to be used.
Link with anchor (not yet published): https://inkscape.org/en/learn/faq#dpi_change
WIP on the FAQ entry (input welcome): https://gitlab.com/inkscape/inkscape-docs/manuals/snippets/1670483