Revert "doxygen: Update for Mbed Crypto"

This reverts commit 32577734e2.

include/mbedtls/dhm.h

@@ -298,6 +298,7 @@ int mbedtls_dhm_calc_secret( mbedtls_dhm_context *ctx,
 void mbedtls_dhm_free( mbedtls_dhm_context *ctx );
 
 #if defined(MBEDTLS_ASN1_PARSE_C)
+/** \ingroup x509_module */
 /**
  * \brief             This function parses DHM parameters in PEM or DER format.
  *
@@ -316,6 +317,7 @@ int mbedtls_dhm_parse_dhm( mbedtls_dhm_context *dhm, const unsigned char *dhmin,
                            size_t dhminlen );
 
 #if defined(MBEDTLS_FS_IO)
+/** \ingroup x509_module */
 /**
  * \brief          This function loads and parses DHM parameters from a file.
  *