doc: add missing options for crypto sign.sign()

Fixes: https://github.com/nodejs/node/issues/22813

PR-URL: https://github.com/nodejs/node/pull/22824
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

doc/api/crypto.md

@@ -1121,6 +1121,8 @@ changes:
 * `privateKey` {string | Object}
   - `key` {string}
   - `passphrase` {string}
+  - `padding` {integer}
+  - `saltLength` {integer}
 * `outputFormat` {string}
 * Returns: {Buffer | string}