Yet more TOC tree fixes

docs/index.rst

@@ -92,10 +92,13 @@ It uses other open-source components as acknowledged in
 `README.txt <https://github.com/Metaswitch/clearwater-docs/blob/master/README.txt>`__.
 
 
+
 .. _1:
 
 .. toctree::
-   :maxdepth: 0
+   :maxdepth: 2
+   :caption: Overview
+   :titlesonly:
 
    Clearwater Architecture <Clearwater_Architecture.rst>
    Clearwater Tour <Clearwater_Tour.rst>
@@ -107,6 +110,8 @@ It uses other open-source components as acknowledged in
 
 .. toctree::
    :maxdepth: 2
+   :caption: Installation
+   :titlesonly:
 
    Installation Instructions <Installation_Instructions.rst>
    All-in-one Images <All_in_one_Images.rst>
@@ -127,6 +132,8 @@ It uses other open-source components as acknowledged in
 
 .. toctree::
    :maxdepth: 2
+   :caption: Upgrading and Modifying
+   :titlesonly:
 
    Upgrading a Clearwater deployment <Upgrading_a_Clearwater_deployment.rst>
    Modifying Clearwater settings <Modifying_Clearwater_settings.rst>
@@ -138,6 +145,8 @@ It uses other open-source components as acknowledged in
 
 .. toctree::
    :maxdepth: 2
+   :caption: Integration
+   :titlesonly:
 
    Configuring an Application Server <Configuring_an_Application_Server.rst>
    External HSS Integration <External_HSS_Integration.rst>
@@ -156,6 +165,8 @@ It uses other open-source components as acknowledged in
 
 .. toctree::
    :maxdepth: 2
+   :caption: Features
+   :titlesonly:
 
    Application Server Guide <Application_Server_Guide.rst>
    WebRTC support in Clearwater <WebRTC_support_in_Clearwater.rst>
@@ -179,6 +190,8 @@ It uses other open-source components as acknowledged in
 
 .. toctree::
    :maxdepth: 2
+   :caption: Failure Recovery
+   :titlesonly:
 
    Permanent Node Failures <Handling_Failed_Nodes.rst>
 
@@ -187,6 +200,8 @@ It uses other open-source components as acknowledged in
 
 .. toctree::
    :maxdepth: 2
+   :caption: Development
+   :titlesonly:
 
    Clearwater C++ Coding Guidelines <Clearwater_CPP_Coding_Guidelines.rst>
    Clearwater Ruby Coding Guidelines <Clearwater_Ruby_Coding_Guidelines.rst>
@@ -198,6 +213,8 @@ It uses other open-source components as acknowledged in
 
 .. toctree::
    :maxdepth: 2
+   :caption: Testing
+   :titlesonly:
 
    Clearwater stress testing <Clearwater_stress_testing.rst>
    Cacti <Cacti.rst>