Man pages matching name svn::notify::html::colordiff in section 3pm:

SVN::Notify::HTML::ColorDiff.3pm.en	debian 10 / libsvn-notify-perl
SVN::Notify::HTML::ColorDiff.3pm.en	debian 11 / libsvn-notify-perl
SVN::Notify::HTML::ColorDiff.3pm.en	debian 12 / libsvn-notify-perl