Remove out of date comment about cache encryption (#32539)

Followup to #32310

Author: tkrupa-intel

src/inference/include/openvino/runtime/properties.hpp

@@ -845,8 +845,6 @@ static constexpr Property<bool, PropertyMutability::RW> enable_weightless{"ENABL
  * when loading from the cache. This property is set in core.compile_model only.
  * - First value of the struct is encryption function.
  * - Second value of the struct is decryption function.
- * @note GPU Plugin: encrypts whole blob, not only model structure. Only used when ov::cache_mode property is set to
- * "OPTIMIZE_SIZE".
  * @ingroup ov_runtime_cpp_prop_api
  */
 static constexpr Property<EncryptionCallbacks, PropertyMutability::WO> cache_encryption_callbacks{