doc: note that randomBytes throws when passed null

Fixes: #16778

PR-URL: #17594
Fixes: #16778
Reviewed-By: Anatoli Papirovski <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>
Reviewed-By: Jon Moss <[email protected]>

Author: tniessen

doc/api/crypto.md

@@ -1792,6 +1792,11 @@ be passed instead of a public key.
 ### crypto.randomBytes(size[, callback])
 <!-- YAML
 added: v0.5.8
+changes:
+  - version: v9.0.0
+    pr-url: https://github.com/nodejs/node/pull/16454
+    description: Passing `null` as the `callback` argument now throws
+                 `ERR_INVALID_CALLBACK`.
 -->
 - `size` {number}
 - `callback` {Function}