doc: fix broken link in crypto.md

URL that lacks a scheme gets treated as a relative URL. Add missing
`https://`.

PR-URL: #35181
Reviewed-By: Derek Lewis <DerekNonGeneric@inf.is>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Harshitha K P <harshitha014@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/crypto.md

@@ -3587,7 +3587,7 @@ See the [list of SSL OP Flags][] for details.
 [RFC 5208]: https://www.rfc-editor.org/rfc/rfc5208.txt
 [encoding]: buffer.html#buffer_buffers_and_character_encodings
 [initialization vector]: https://en.wikipedia.org/wiki/Initialization_vector
-[list of SSL OP Flags]: wiki.openssl.org/index.php/List_of_SSL_OP_Flags#Table_of_Options
+[list of SSL OP Flags]: https://wiki.openssl.org/index.php/List_of_SSL_OP_Flags#Table_of_Options
 [safe integers]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger
 [scrypt]: https://en.wikipedia.org/wiki/Scrypt
 [stream]: stream.html