Improve ASN1_TIME_print documentation and output

Improve ASN1_TIME_print documentation and output

This adds missing GMT indication when printing the local time as
it is converted to the UTC timezone before printing.

Also fixing the fractional seconds printing on EBCDIC platforms.

Fixes #26313

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26344)

(cherry picked from commit c81ff978667e7c0d792e02db7a02b7bc12433abd)