Goto menu File > Templates. Hover item "Save as Template" and press F1 to open the associated help page. In the section "To access this command" you see the error message "D'oh! You found a bug (text/shared/00/00000401.xhp#dokuspei not found)."

This variable had been removed, when implementing the new template manager. Then the menu item Template has been reintroduced including the command "Save as Template" which is actually command .uno:SaveAsTemplate. But the help pages were not adapted to the new situation. So in fact not only the variable is missing, but the whole content is wrong; it belongs to the old template manager.

When you customize a toolbar and add the icon for command .uno:SaveAsTemplate and call the help with F1 from there, the default module page is called instead of a page associated to the command .uno:SaveAsTemplate.