DOCS: The interpretation of OPENSSL_API_COMPAT has changed, update docs
DOCS: The interpretation of OPENSSL_API_COMPAT has changed, update docs

Reviewed-by: Matthias St. Pierre <1910231d24f125aceac7850dc92279eee8d52323@ncp-e.com>
Reviewed-by: Paul Yang <184f6de988fc88cc661c91bad2c53ca35ab2d101@antfin.com>
(Merged from https://github.com/openssl/openssl/pull/10765)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl