Minor updates in doc/comments/debug

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/library/ssl_tls12_client.c b/library/ssl_tls12_client.c
index 9b2da5a..75783d0 100644
--- a/library/ssl_tls12_client.c
+++ b/library/ssl_tls12_client.c
@@ -1964,7 +1964,7 @@
                                   ssl->out_msg + offset + len_bytes, olen,
                                   MBEDTLS_SSL_OUT_CONTENT_LEN - offset - len_bytes,
                                   ssl->conf->f_rng, ssl->conf->p_rng)) != 0) {
-        MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_rsa_pkcs1_encrypt", ret);
+        MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_pk_encrypt", ret);
         return ret;
     }