ssh::pam: Add note about pam_slurm

manifests/ssh/pam.pp

@@ -4,6 +4,9 @@
 # regular logins.
 #
 # Currently, only Debian is supported when $pam_duo is true.
+#
+# If you are using the SLURM job scheduler, setting $pam_slurm to true will
+# cause user logins to be rejected unless they have a valid job allocation.
 
 class ssh::pam (
   $pam_afs   = true,