Remove def directive for version symbol

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 80bbebd..21f0c77 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -25,8 +25,6 @@
  */
 
 /**
- * \def MBEDTLS_CONFIG_VERSION
- *
  * This is an optional version symbol that enables comatibility handling of
  * config files.
  *