added note for compatible_packages w build=missing (#1491)
added note for compatible_packages w build=missing (#1491)

* added note for compatible_packages w build=missing

* Update creating_packages/define_abi_compatibility.rst

Co-Authored-By: Daniel <a1b3f3fb8224a9da316016fb943080a5ba707bde@gmail.com>

* Update creating_packages/define_abi_compatibility.rst

Co-Authored-By: Daniel <a1b3f3fb8224a9da316016fb943080a5ba707bde@gmail.com>

conan-io/docs,conan-io/docs,conan-io/docs,conan-io/docs