Later EliteBooks use different EC chips and have different EC firmware interfaces, so rename the document elitebook_series.md to a more precise name and also do some rewriting. A link to the code review page for 8760w is also added because the port for this laptop is not merged yet. Change-Id: I2f9b8c4e52ed760c16977d16838cca9e490cda05 Signed-off-by: Iru Cai <mytbk920423@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/40315 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>