crypto: add better scrypt option aliases

Make parameter names available in a human-readable way, for
more accessible/self-documenting usage of the `scrypt` functions.
This implements a review comment from the original PR that has
not been addressed.
Refs: #20816 (comment)
PR-URL: #21525
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>

Author: addaleax

doc/api/crypto.md

@@ -2163,7 +2163,6 @@ changes:
 *`keylen` {number}
 *`options` {Object}
 -`cost` {number} CPU/memory cost parameter. Must be a power of two greater
--`N` {number} CPU/memory cost parameter. Must be a power of two greater
  than one. **Default:**`16384`.
 -`blockSize` {number} Block size parameter. **Default:**`8`.
 -`parallelization` {number} Parallelization parameter. **Default:**`1`.
@@ -2218,7 +2217,6 @@ changes:
 *`keylen` {number}
 *`options` {Object}
 -`cost` {number} CPU/memory cost parameter. Must be a power of two greater
--`N` {number} CPU/memory cost parameter. Must be a power of two greater
  than one. **Default:**`16384`.
 -`blockSize` {number} Block size parameter. **Default:**`8`.
 -`parallelization` {number} Parallelization parameter. **Default:**`1`.