[DOC] Document password option for opensearch-keystore create

[terryquigleysas]

What do you want to do?

• Request an addition to existing documentation

Tell us about your request. Provide a summary of the request.
The opensearch-keystore create command supports an option to provide a password but is not currently documented in https://opensearch.org/docs/latest/security/configuration/opensearch-keystore/

I found this from looking at the code https://github.com/opensearch-project/OpenSearch/blob/main/distribution/tools/keystore-cli/src/main/java/org/opensearch/common/settings/CreateKeyStoreCommand.java#L57 but it would obviously have been easier from the docs.

`opensearch-keystore create --help
Creates a new opensearch keystore

Option Description

---

-E Configure a setting
-h, --help Show help
-p, --password Prompt for password to encrypt the keystore
-s, --silent Show minimal output
-v, --verbose Show verbose output`

Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
2.18 and likely all

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
https://www.elastic.co/guide/en/elasticsearch/reference/current/elasticsearch-keystore.html
https://www.elastic.co/guide/en/elasticsearch/reference/7.10/elasticsearch-keystore.html