ECDH: Fix whitespace and doxygen comment
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 0d10ea6..a7308f8 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -3535,7 +3535,7 @@
  */
 //#define MBEDTLS_PLATFORM_GMTIME_R_ALT
 
-/*
+/**
  * \def MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED
  *
  * Enable the verified implementations of crypto primitives