Add NEWS and RELEASE_NOTES for the interactive step.

NEWS

@@ -101,6 +101,9 @@ documents those changes that are of interest to users and administrators.
     GRES to manage multiple device files simultaneously.
  -- Fix scontrol write config to output OverSubscribe intead of Shared.
  -- job_submit/lua - print/access oversubscribe variable with "oversubscribe".
+ -- Remove SallocDefaultCommand option.
+ -- Add support for an "Interactive Step", designed to be used with salloc to
+    launch a terminal on an allocated compute node automatically.
 * Changes in Slurm 20.02.6
 ==========================

RELEASE_NOTES

@@ -68,6 +68,10 @@ HIGHLIGHTS
     others via the NodeName option.
  -- gres.conf - Add new MultipleFiles configuration entry to allow a single
     GRES to manage multiple device files simultaneously.
+ -- Remove SallocDefaultCommand option.
+ -- Add support for an "Interactive Step", designed to be used with salloc to
+    launch a terminal on an allocated compute node automatically. Enable by
+    setting "use_interactive_step" as part of LaunchParameters.
 
 CONFIGURATION FILE CHANGES (see man appropriate man page for details)
 =====================================================================