fix head manpage

date.c

@@ -8,8 +8,8 @@
 int
 main(int argc, char *argv[])
 {
-	char buf[BUFSIZ], c, *end;
-	char *fmt = "%c";
+	char buf[BUFSIZ], c;
+	char *end, *fmt = "%c";
 	struct tm *now = NULL;
 	time_t t;
 

head.1

@@ -8,7 +8,8 @@ head \- output first part of files
 .RI [ file ...]
 .SH DESCRIPTION
 .B head
-writes the first 10 lines of each file to stdout.
+writes the first 10 lines of each file to stdout.  If no file is given, head
+reads from stdin.
 .SH OPTIONS
 .TP
 .BI \-n " lines"