Comment decrypt & encrypt callback entries of mbedtls_pk_ecdsa_opaque_info as not relevant

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/library/pk_wrap.c b/library/pk_wrap.c
index d854330..a9c3c71 100644
--- a/library/pk_wrap.c
+++ b/library/pk_wrap.c
@@ -1589,8 +1589,8 @@
     NULL, /* restartable verify - not relevant */
     NULL, /* restartable sign - not relevant */
 #endif
-    NULL, /* decrypt - will be done later */
-    NULL, /* encrypt - will be done later */
+    NULL, /* decrypt - not relevant */
+    NULL, /* encrypt - not relevant */
     NULL, /* check_pair - could be done later or left NULL */
     pk_opaque_alloc_wrap,
     pk_opaque_free_wrap,