add flavors:update to deis help flavors

Author: Gabriel Monroy

client/deis.py

@@ -911,6 +911,7 @@ def flavors(self, args):
         flavors:create        create a new node flavor
         flavors:info          print information about a node flavor
         flavors:list          list available flavors
+        flavors:update        update an existing node flavor
         flavors:delete        delete a node flavor
 
         Use `deis help [command]` to learn more

docs/components/formation.rst

@@ -0,0 +1,11 @@
+:title: Formation
+:description: A Deis formation is a set of infrastructure used to host applications.
+:keywords: formation, deis
+
+.. _formation:
+
+Formation
+=========
+A :ref:`formation` is a set of infrastructure used to host :ref:`Applications <application>`.
+Each formation includes :ref:`Layers <layer>` of :ref:`Nodes <node>` 
+that provide different services to the formation.