[doc] Sync documentation now that 3.0 honors OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT

[doc] Sync documentation now that 3.0 honors OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT

https://github.com/openssl/openssl/pull/19901 backported the
"Honor OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT as set and default to
UNCOMPRESSED" changeset to 3.0.

This commit updates:

- the HISTORY notes of the relevant documentation to mark the change
  happened since 3.0.8.

- the `CHANGES.md file` to sync up with the tip of the `openssl-3.0`
  branch

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20003)