unix/mpconfigport.mk: Update comment about TLS implementations.

As long as the submodule is checked out, mbedTLS is now fully integrated
into the unix build if MICROPY_SSL_MBEDTLS=1.

ports/unix/mpconfigport.mk

@@ -25,13 +25,11 @@ MICROPY_PY_FFI = 1
 
 # ussl module requires one of the TLS libraries below
 MICROPY_PY_USSL = 1
-# axTLS has minimal size and fully integrated with MicroPython, but
-# implements only a subset of modern TLS functionality, so may have
-# problems with some servers.
+# axTLS has minimal size but implements only a subset of modern TLS
+# functionality, so may have problems with some servers.
 MICROPY_SSL_AXTLS = 1
 # mbedTLS is more up to date and complete implementation, but also
-# more bloated. Configuring and building of mbedTLS should be done
-# outside of MicroPython, it can just link with mbedTLS library.
+# more bloated.
 MICROPY_SSL_MBEDTLS = 0
 
 # jni module requires JVM/JNI