mbedtls/docs/3.0-migration-guide.d/Remove_3DES_ciphersuites.md

Remove 3DES ciphersuites

This change does not affect users using default settings for 3DES in config.h because the 3DES ciphersuites were disabled by that.

3DES has weaknesses/limitations and there are better alternatives, and more and more standard bodies are recommending against its use in TLS.

The migration path here is to chose from the recomended in literature alternatives.