[openssl/openssl] 63b94b: Clarify dashes are required for openssl list command

[crox]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 63b94b3fc7feb12713fa46d386e10d109f074d28
      https://github.com/openssl/openssl/commit/63b94b3fc7feb12713fa46d386e10d109f074d28
  Author: Jeff Croxell <jcroxell at gmail.com>
  Date:   2022-08-19 (Fri, 19 Aug 2022)

  Changed paths:
    M doc/man1/openssl.pod

  Log Message:
  -----------
  Clarify dashes are required for openssl list command

Fixes #19013

CLA: trivial

Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19031)