[patch] strfry.3: Remove incorrect reference to rand(3)

[Keith Thompson <keithsthompson@xxxxxxxxx>]

The strfry(3) function does not use rand(). The original version from
1995 did, but it was
changed to use a different PRNG in glibc commit
4770745624b7f7f25623f1f10d46a4c4d6aec25c,
1996-12-04.

This C program demonstrates the behavior. By not calling srand(), it
gets the same values
for successive calls to rand(), but strfry() returns a different value
each time the program is run.
If strfry() called srand(), it would alter the sequence of numbers
return by rand().

#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(void) {
    printf("%d\n", rand());
    char alphabet[] = "abcdefghijklmnopqrstuvwxyz";
    puts(strfry(alphabet));
    printf("%d\n", rand());
}

Patch follows:

commit e7be0424538b50d49817200ccafc56cf742813bf (HEAD -> kst-strfry)
Author: Keith Thompson <Keith.S.Thompson@xxxxxxxxx>
Date:   2018-11-08 16:09:06 -0800

    man3/strfry.3: Remove incorrect reference to rand(3)

diff --git man3/strfry.3 man3/strfry.3
index a4c02435d..5beefa42c 100644
--- man3/strfry.3
+++ man3/strfry.3
@@ -42,10 +42,7 @@ The
 .BR strfry ()
 function randomizes the contents of
 .I string
-by
-using
-.BR rand (3)
-to randomly swap characters in the string.
+by randomly swapping characters in the string.
 The result is an anagram of
 .IR string .
 .SH RETURN VALUE