sranddev() is not magic pixie dust. While it gives a good random

seed, the random number generator rand(3) still sucks and is unlikely
sufficient for crypto use.  Correct what appears to be a cut and paste
error from the srandomdev() man page.

Submitted by: Ben Mesander

lib/libc/stdlib/rand.3

@@ -91,8 +91,10 @@ The
 .Fn sranddev
 function initializes a seed using the
 .Xr random 4
-random number device which returns good random numbers,
-suitable for cryptographic use.
+random number device which returns good random numbers.
+However, the
+.Fn rand
+function still remains unsuitable for cryptographic use.
 .Pp
 The
 .Fn rand_r