website: update graph command

website/source/docs/commands/graph.html.markdown

@@ -25,16 +25,20 @@ The graph is outputted in DOT format. The typical program that can
 read this format is GraphViz, but many web services are also available
 to read this format.
 
+The -type flag can be used to control the type of graph shown. Terraform
+creates different graphs for different operations. See the options below
+for the list of types supported. The default type is "plan" if a
+configuration is given, and "apply" if a plan file is passed as an
+argument.
+
 Options:
 
 * `-draw-cycles`    - Highlight any cycles in the graph with colored edges.
                       This helps when diagnosing cycle errors.
 
-* `-module-depth=n` - The maximum depth to expand modules. By default this is
-                      -1, which will expand all modules.
+* `-no-color`       - If specified, output won't contain any color.
 
-* `-verbose`        - Generate a verbose, "worst-case" graph, with all nodes
-                      for potential operations in place.
+* `-type=plan`      - Type of graph to output. Can be: plan, plan-destroy, apply, legacy.
 
 ## Generating Images