Update openssl command to list digest algos in docs

[RichAyotte]

Documentation update in https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm_options

The algorithm is dependent on the available algorithms supported by the version of OpenSSL on the platform. Examples are 'sha256', 'sha512', etc. On recent releases of OpenSSL, openssl list-message-digest-algorithms will display the available digest algorithms.

Replace the openssl command

openssl list-message-digest-algorithms

with

openssl list -digest-algorithms

Tested with:

$ openssl version
OpenSSL 1.1.0h 27 Mar 2018

[addaleax]

I think we might want to list both? I don’t think we can assume that the global openssl CLI for a user will match Node’s openssl version.

[shobhitchittora]

Hey I'd like to make a PR for this. I hope the following text for the doc works -

The algorithm is dependent on the available algorithms supported by the version of OpenSSL on the platform. Examples are 'sha256', 'sha512', etc. On recent releases of OpenSSL, openssl list digest-algorithms ( openssl list-message-digest-algorithms for older versions of OpenSSL ) will display the available digest algorithms.

@RichAyotte Shouldn't the new command be - (note the missing '-' before digest)

openssl list digest-algorithms

[RichAyotte]

@shobhitchittora the dash is required.