fix sha1pickle signature

Reference: /n/sources/patch/applied/sha1pickleman
Date: Sat Oct 25 15:58:29 CES 2008
Signed-off-by: quanstro@quanstro.net

--- /sys/man/2/sechash	Sat Oct 25 15:58:24 2008
+++ /sys/man/2/sechash	Sat Oct 25 15:58:23 2008
@@ -33,10 +33,10 @@
 DigestState*	sha1(uchar *data, ulong dlen, uchar *digest, DigestState *state)
 .PP
 .B
-char*		sha1pickle(MD5state *state)
+char*		sha1pickle(SHA1state *state)
 .PP
 .B
-MD5state*	sha1unpickle(char *p);
+SHA1state*	sha1unpickle(char *p);
 .PP
 .Ti
 .B