Modf(2) returns the SIGNED fractional part of value.

Reference: /n/sources/patch/applied/modf-man
Date: Fri Jul  4 00:37:25 CES 2008
Signed-off-by: djeannot24@gmail.com

--- /sys/man/2/frexp	Fri Jul  4 00:36:02 2008
+++ /sys/man/2/frexp	Fri Jul  4 00:36:00 2008
@@ -32,7 +32,7 @@
 .if n .IR value *2** exp.
 .PP
 .I Modf
-returns the positive fractional part of
+returns the signed fractional part of
 .I value
 and stores the integer part indirectly
 through