fixed another typo

Author: andriisoldatenko

README.rst

@@ -18,12 +18,12 @@ Design
 ------
 **aiohttp_admin** using following design philosophy:
 
-- backend and frontend of admin views are decoupled by REST API as
+- backend and frontend of admin views are decoupled by REST API as a
   result it is possible to change admin views without changing any **python**
   code. On browser side user interacts with single page application (ng-admin).
 
 - admin views are database agnostic, if it is possible to implement REST API
-  it should be strait forward to add admin views. Some filtering features may
+  it should be straightforward to add admin views. Some filtering features may
   be disabled if database do not support some kind of filtering.