Added table of content to node-selection.

This can help generate the table of content so that other files can make reference of different sections.
kubernetes · Mar 17, 2017 · 127276b · 127276b
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commit 127276b
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diff --git a/docs/user-guide/node-selection/index.md b/docs/user-guide/node-selection/index.md
@@ -5,6 +5,9 @@ assignees:
 title: Assigning Pods to Nodes
 ---
 
+* TOC
+{:toc}
+
 You can constrain a [pod](/docs/user-guide/pods/) to only be able to run on particular [nodes](/docs/admin/node/) or to prefer to
 run on particular nodes. There are several ways to do this, and they all use
 [label selectors](/docs/user-guide/labels/) to make the selection.