Should not the “Comment formatting” page information be corrected?

The comment formatting page for CG.SE mentions that to add a linebreak to a comment, one just has to

End a line with two spaces

I tried to add a line break to a comment following above procedure, it did not work.

Should not the "Comment formatting" page information be corrected?
Or alternately, should not the features described by the "Comment formatting" page be supported?