Add missing props phpDocs to `sfSessionStorage`
Add missing props phpDocs to `sfSessionStorage`

rock-symphony/rock-symphony,rock-symphony/rock-symphony,rock-symphony/rock-symphony,simoncast/symfony1,Recras/symfony1,simoncast/symfony1,MDrollette/symfony1,MDrollette/symfony1,Recras/symfony1,MDrollette/symfony1,Recras/symfony1,simoncast/symfony1