Import wiki updates for some pages
    
    After Package Maintainer Docs were imported from the wiki
    there have been some further wiki updates.
    To avoid losing content when wiki pages are replaced
    with links to the Package Maintainer Docs,
    these updates are imported in this commit.
    
    Due to large amount of pages
    not all pages are handled in this commit.
    The "Imported from:" comment is removed
    from the top of the pages that are handled
    so that it is easy to spot the pages that have not been handled.