doc/man3/OPENSSL_malloc.pod: size is no longer needed to be alignment multiple

doc/man3/OPENSSL_malloc.pod: size is no longer needed to be alignment multiple

While the commit 648803a17e4c1 "crypto/mem.c: don't use aligned_alloc
in CRYPTO_aligned_alloc" removed the aligned_alloc() usage
along with its overly onerous requirements, its author failed to update
the documentation accordingly.  Correct that omission by removing
the requirement from the DESCRIPTION and adding a relevant mention
in HISTORY.

Complements: 648803a17e4c1 "crypto/mem.c: don't use aligned_alloc in CRYPTO_aligned_alloc"
Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28295)