In templates DSL documentation, on `help.html` page, in section "Basic building blocks - macros, variables, methods", there is link to list of all macros:

See all available macros <a>here</a>.

That links points to "/dsldoc/all", which is directory - user will see list of all directory content, or error page (depending on web server setting). That link should point to "/dsldoc/all.html", which is generated documentation page.