See https://daringfireball.net/projects/markdown/syntax for the Markdown syntax used for the help strings. Common mistake may be that an empty line is needed before and after the list block.
This does NOT work. No blank like after this paragraph.
* First list item.
* Second list item.
This DOES work. Note the empty line after this paragraph.
* First list item.
* Second list item.
It would be a bug if it did not work in locally customised strings.