psa: Fix references to macros in comments

This commit tries to fix the usage of #MACRO_NAME
to reference macros in comments.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/psa_crypto_slot_management.h b/library/psa_crypto_slot_management.h
index 9470b3e..2b90ce8 100644
--- a/library/psa_crypto_slot_management.h
+++ b/library/psa_crypto_slot_management.h
@@ -33,7 +33,7 @@
  *
  *  The last PSA_KEY_SLOT_COUNT identifiers of the implementation range
  *  of key identifiers are reserved for volatile key identifiers.
- *  A volatile key identifier is equal to PSA_KEY_ID_VOLATILE_MIN plus the
+ *  A volatile key identifier is equal to #PSA_KEY_ID_VOLATILE_MIN plus the
  *  index of the key slot containing the volatile key definition.
  */
 
@@ -97,7 +97,7 @@
 
 /** Initialize the key slot structures.
  *
- * \retval PSA_SUCCESS
+ * \retval #PSA_SUCCESS
  *         Currently this function always succeeds.
  */
 psa_status_t psa_initialize_key_slots( void );