Add TreeWidth documentation to slurm.conf man.

NEWS

@@ -8,8 +8,8 @@ documents those changes that are of interest to users and admins.
     really useful for developers.
  -- New communication is now branched on all processes to slurmd's from 
     slurmctld and srun launch command.  This is done with a tree type 
-    algorythm.  Spawn and batch mode work the same as before.  New slurm.conf
-    variable SpanCount=50 is default.  This is the number of threads per 
+    algorithm.  Spawn and batch mode work the same as before.  New slurm.conf
+    variable TreeWidth=50 is default.  This is the number of threads per 
     stop on the tree.  
  -- Configuration parameter HeartBeatInterval is depracated. Now used half
     of SlurmdTimeout and SlurmctldTimeout for communications to slurmd and

doc/man/man5/slurm.conf.5

@@ -515,6 +515,11 @@ temporary storage. This parameter is used in establishing a node's \fBTmpDisk\fR
 space. 
 The default value is "/tmp".
 .TP
+\fBTreeWidth\fR
+\fBSlurmd\fR daemons use a virtual tree network for communications.
+\fBTreeWidth\fR specifies the width of the tree (i.e. the fanout).
+The defautl value is 50.
+.TP
 \fBWaitTime\fR
 Specifies how many seconds the srun command should by default wait after 
 the first task terminates before terminating all remaining tasks. The