max_early_data_size: rename configuration function

Rename mbedtls_ssl_tls13_conf_max_early_data_size as
mbedtls_ssl_conf_max_early_data_size since in the future
this may not be specific to TLS 1.3.

Signed-off-by: Yanray Wang <yanray.wang@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 6a940d4..39884dc 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -4080,7 +4080,7 @@
  * \def MBEDTLS_SSL_MAX_EARLY_DATA_SIZE
  *
  * The default maximum amount of 0-RTT data. See the documentation of
- * \c mbedtls_ssl_tls13_conf_max_early_data_size() for more information.
+ * \c mbedtls_ssl_conf_max_early_data_size() for more information.
  *
  * It must be positive and smaller than UINT32_MAX.
  *