Fixed Rprint Vars fmt arg in doc

Fixed Rprint Vars in doc string to show proper use of fmt argument.

Change-Id: Ib02d34bcfe7ecf4cb7743c5ea53361192867cdff
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/lib/dump_utils.py b/lib/dump_utils.py
index 0c4a880..c149d77 100755
--- a/lib/dump_utils.py
+++ b/lib/dump_utils.py
@@ -28,7 +28,7 @@
     Example robot program call:
 
     ${dump_dict}=  Get Dump Dict
-    Rpvars                          1  dump_dict
+    Rprint Vars  dump_dict  fmt=terse
 
     Example output: