help-split-fundoc

help-split-fundoc is a compiled Lisp function in `help.el'.

(help-split-fundoc DOCSTRING DEF)

Split a function DOCSTRING into the actual doc and the usage info.
Return (USAGE . DOC) or nil if there's no usage info, where USAGE info
is a string describing the argument list of DEF, such as
"(apply FUNCTION &rest ARGUMENTS)".
DEF is the function whose usage we're looking for in DOCSTRING.