Update design-philosophy.rst

docs/sphinx/source/design-philosophy.rst

@@ -3,7 +3,8 @@ Design Philosophy
 
 Given a large number of black-box optimizers (BBO) versions/variants which still keep increasing almost every week,
 we need some (possibly) widely acceptable criteria to select from them, as presented below in details. For any
-**new/missed** BBO, we provide a *unified* API interface to help freely add them, if necessary.
+**new/missed** BBO, we have provided an open-access (unified API) interface to help freely add them, **if
+necessary**.
 
 Respect for Beauty (Elegance)
 -----------------------------