Plural, not possessive.

Reference: /n/sources/patch/applied/man-sig-functions
Date: Thu Jul  8 16:41:44 CES 2010
Signed-off-by: a@9srv.net

--- /sys/man/1/man	Thu Jul  8 16:41:15 2010
+++ /sys/man/1/man	Thu Jul  8 16:41:14 2010
@@ -84,7 +84,7 @@
 .PP
 .B Sig
 prints the signature (i.e. C definition) of the
-.IR function 's
+.IR function s
 given on the command line.
 .SH FILES
 .TP