bug#9259: extra line in "unless" docstring?

[jidanni]

unless is a Lisp macro in `subr.el'.

(unless COND BODY...)

If COND yields nil, do BODY, else return nil. <--------what is this line doing 
here?
When COND yields nil, eval BODY forms sequentially and return
value of last one, or nil if there are none.