[openssl/openssl] 175068: doc: fix description of mac "block-size" parameter

[James Muir]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 1750689767cc922bdbe73358f7256475f0838c67
      https://github.com/openssl/openssl/commit/1750689767cc922bdbe73358f7256475f0838c67
  Author: James Muir <james at openssl.org>
  Date:   2023-11-22 (Wed, 22 Nov 2023)

  Changed paths:
    M doc/man7/EVP_MAC-BLAKE2.pod
    M doc/man7/EVP_MAC-CMAC.pod
    M doc/man7/EVP_MAC-HMAC.pod
    M doc/man7/EVP_MAC-KMAC.pod

  Log Message:
  -----------
  doc: fix description of mac "block-size" parameter

The macro for "block-size" is OSSL_MAC_PARAM_BLOCK_SIZE, and this
parameter is not settable.  Refer to the "customization string" rather
than the "custom value" (in the Blake2 spec, this is called the
personalization string).

Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Richard Levitte <levitte at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22763)