man pages: fix epn.conf.5 and ipa-epn.1 formatting
    
    Fix formatting issues found with mandoc.
    
    Signed-off-by: François Cami <fcami@redhat.com>
    Reviewed-By: Alexander Bokovoy <abbra@users.noreply.github.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>