fix for a couple of missing words (#6444)

Author: carlfarrington

docs/api-guide/permissions.md

@@ -10,9 +10,9 @@ Together with [authentication] and [throttling], permissions determine whether a
 
 Permission checks are always run at the very start of the view, before any other code is allowed to proceed.  Permission checks will typically use the authentication information in the `request.user` and `request.auth` properties to determine if the incoming request should be permitted.
 
-Permissions are used to grant or deny access different classes of users to different parts of the API.
+Permissions are used to grant or deny access for different classes of users to different parts of the API.
 
-The simplest style of permission would be to allow access to any authenticated user, and deny access to any unauthenticated user. This corresponds the `IsAuthenticated` class in REST framework.
+The simplest style of permission would be to allow access to any authenticated user, and deny access to any unauthenticated user. This corresponds to the `IsAuthenticated` class in REST framework.
 
 A slightly less strict style of permission would be to allow full access to authenticated users, but allow read-only access to unauthenticated users. This corresponds to the `IsAuthenticatedOrReadOnly` class in REST framework.