mbedtls/docs/3.0-migration-guide.d/rename_the__ret_functions.md

Rename mbedtls_*_ret() cryptography functions whose deprecated variants have been removed in #4029

This change affects users who were using the mbedtls_*_ret() cryptography functions.

Those functions were created based on now-deprecated functions according to a requirement that a function needs to return a value. This change brings back the original names of those functions.

To migrate to the this change the user can keep the *_ret names in their code and include the compat_2.x.h header file which holds macros with proper renaming or to rename those function in their code according to the list from mentioned header file.