Additional fixes for OPENIG-163 based on review suggestions from Christophe

    In both Federation chapters, .war ==> war file
    In http://openig.forgerock.org/doc/gateway-guide/#federation-configuration-files , gateway.cot ==> fedlet


git-svn-id: https://svn.forgerock.org/openig/trunk@500 dbb9e58e-28e6-4ce0-90e8-f11d9605b710