Minor reword

Author: javiereguiluz

security/voters.rst

@@ -251,9 +251,9 @@ strategies available:
     This grants access if there are more voters granting access than denying;
 
 ``unanimous``
-    This only grants access if there is no voter denying access. 
-    ``allow_if_all_abstain`` configuration option can be used if voter granting 
-    access is also required.
+    This only grants access if there is no voter denying access. If all voters
+    abstained from voting, the decision is based on the ``allow_if_all_abstain``
+    config option (which defaults to ``false``).
 
 In the above scenario, both voters should grant access in order to grant access
 to the user to read the post. In this case, the default strategy is no longer