DOCS: Update the page for 'openssl passwd' to not duplicate some info

DOCS: Update the page for 'openssl passwd' to not duplicate some info

The options -1 and -apr1 were mentioned in DESCRIPTION, not mentioning
any other options or even mentioning that there are more algorithms.
The simple fix is to remove that sentence and let the OPTIONS section
speak for itself.

Fixes #16529

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16531)