Fix typos in hash_info.[ch]

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/library/hash_info.c b/library/hash_info.c
index f2a4ba0..c3a81cf 100644
--- a/library/hash_info.c
+++ b/library/hash_info.c
@@ -95,7 +95,7 @@
     return entry->psa_alg;
 }
 
-/* Get PSA from MD */
+/* Get MD from PSA */
 mbedtls_md_type_t mbedtls_hash_info_md_from_psa( psa_algorithm_t psa_alg )
 {
     const hash_entry *entry = hash_table;