Update documentation

std/random.d

@@ -1838,8 +1838,8 @@ random number sequences every run.
 This function utilizes the system $(I cryptographically-secure pseudo-random
 number generator (CSPRNG)) or $(I pseudo-random number generator (PRNG))
 where available and implemented (currently `arc4random` on applicable BSD
-systems or `getrandom` on Linux) to generate “high quality” pseudo-random
-numbers – if possible.
+systems, `getrandom` on Linux or `BCryptGenRandom` on Windows) to generate
+“high quality” pseudo-random numbers – if possible.
 As a consequence, calling it may block under certain circumstances (typically
 during early boot when the system's entropy pool has not yet been
 initialized).