[openssl/openssl] 1a5118: Clarify the PKCS12 docs

[Matt Caswell]

  Branch: refs/heads/openssl-3.1
  Home:   https://github.com/openssl/openssl
  Commit: 1a51185ceef2561efd0c33af0244600e1dbac149
      https://github.com/openssl/openssl/commit/1a51185ceef2561efd0c33af0244600e1dbac149
  Author: Matt Caswell <matt at openssl.org>
  Date:   2024-01-04 (Thu, 04 Jan 2024)

  Changed paths:
    M doc/man3/PKCS12_create.pod

  Log Message:
  -----------
  Clarify the PKCS12 docs

Issue #23151 asks a question about the meaning of the PKCS12
documentation. This PR attempts to clarify how friendlyName and localKeyID
are added to the PKCS12 structure.

Fixes #23151

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Neil Horman <nhorman at openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove at arm.com>
(Merged from https://github.com/openssl/openssl/pull/23188)

(cherry picked from commit 3348713ad390372ba5a0a0f98b46b2f637475e47)