Add an explanation to ndk_library.

	// https://github.com/android-ndk/ndk/issues/265.

	Unversioned_until *string

	// Headers presented by this library to the Public API Surface

	// DO NOT USE THIS

	// NDK libraries should not export their headers. Headers belonging to NDK

	// libraries should be added to the NDK with an ndk_headers module.

	Export_header_libs []string

	// Do not add other export_* properties without consulting with danalbert@.

	// Consumers of ndk_library modules should emulate the typical NDK build

	// behavior as closely as possible (that is, all NDK APIs are exposed to

	// builds via --sysroot). Export behaviors used in Soong will not be present

	// for app developers as they don't use Soong, and reliance on these export

	// behaviors can mask issues with the NDK sysroot.

}

type stubDecorator struct {