[openssl/openssl] a2c0a9: Add documentation for the OPENSSL_gmtime functions

[Todd Short]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: a2c0a959e0bb26fc5aa5c822ecee30135b08a282
      https://github.com/openssl/openssl/commit/a2c0a959e0bb26fc5aa5c822ecee30135b08a282
  Author: Todd Short <tshort at akamai.com>
  Date:   2022-09-26 (Mon, 26 Sep 2022)

  Changed paths:
    M doc/build.info
    A doc/man3/OPENSSL_gmtime.pod
    M util/missingcrypto.txt

  Log Message:
  -----------
  Add documentation for the OPENSSL_gmtime functions

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
Reviewed-by: Hugo Landau <hlandau at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19257)

(cherry picked from commit 28a5aa0cbdddfdf4d82a437d72407d4f52d4e54a)