Update documentation with rbac_utils details

This PS re-organizes the Patrole documentation for the framework.
It also adds documentation for rbac_utils.

Change-Id: I7a512694e8173129a290dbfc99c1ad983c4addd9
diff --git a/doc/source/index.rst b/doc/source/index.rst
index e2cc0bd..308c12c 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -30,7 +30,10 @@
 .. toctree::
    :maxdepth: 2
 
-   rbac_validation
+   framework/overview
+   framework/rbac_validation
+   framework/policy_authority
+   framework/rbac_utils
 
 Indices and tables
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