conf/magic: Refer to "OpenISR 0.8 binary keyring"
conf/magic: Refer to "OpenISR 0.8 binary keyring"

- Update descriptive text for binary keyrings to mention that they are
specific to OpenISR 0.8

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr