Stop recommended deprecated function in migration guide

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/docs/3.0-migration-guide.md b/docs/3.0-migration-guide.md
index 63a13ad..42af9db 100644
--- a/docs/3.0-migration-guide.md
+++ b/docs/3.0-migration-guide.md
@@ -748,7 +748,7 @@
 
 The default preference order for curves in TLS now favors resource usage (performance and memory consumption) over size. The exact order is unspecified and may change, but generally you can expect 256-bit curves to be preferred over larger curves.
 
-If you prefer a different order, call `mbedtls_ssl_conf_curves()` when configuring a TLS connection.
+If you prefer a different order, call `mbedtls_ssl_conf_groups()` when configuring a TLS connection.
 
 ### SSL key export interface change
 
@@ -1025,7 +1025,7 @@
 my_profile.allowed_mds |= MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 );
 ```
 
-If you still need to allow hashes and curves in TLS that have been removed from the default configuration, call `mbedtls_ssl_conf_sig_hashes()` and `mbedtls_ssl_conf_curves()` with the desired lists.
+If you still need to allow hashes and curves in TLS that have been removed from the default configuration, call `mbedtls_ssl_conf_sig_hashes()` and `mbedtls_ssl_conf_groups()` with the desired lists.
 
 ### Remove 3DES ciphersuites