Update documentation of g_tls_connection_handshake
Update documentation of g_tls_connection_handshake

Rehandshaking is not a thing in TLS 1.3. In that case,
g_tls_connection_handshake() should instead perform a re-key.

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib