Doxygen fixes

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index b5c0d58..f2451cb 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -3301,7 +3301,9 @@
  */
 //#define MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_IF_PRESENT
 
-/*
+/**
+ * \def MBEDTLS_SHA256_USE_A64_CRYPTO_IF_PRESENT
+ *
  * \deprecated This is now known as MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_IF_PRESENT.
  * This name is now deprecated, but may still be used as an alternative form for
  * this option.
@@ -3325,7 +3327,7 @@
  * armclang <= 6.9
  *
  * \note This was previously known as MBEDTLS_SHA256_USE_A64_CRYPTO_ONLY.
- * That name is deprecated, but may still be used as an alternative form for this
+ * That name is \deprecated, but may still be used as an alternative form for this
  * option.
  *
  * \warning MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_ONLY cannot be defined at the same
@@ -3340,7 +3342,9 @@
  */
 //#define MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_ONLY
 
-/*
+/**
+ * \def MBEDTLS_SHA256_USE_A64_CRYPTO_ONLY
+ *
  * \deprecated This is now known as MBEDTLS_SHA256_USE_ARMV8_A_CRYPTO_ONLY.
  * This name is now deprecated, but may still be used as an alternative form for
  * this option.