Doc: Increased `autosectionlabel_maxdepth`

This patch increases the default depth of the
`autosectionlabel_maxdepth` parameter to 2, enabling referencing
to the top-level headings across documentation by using the
`sphinx.ext.autosectionlabel` plug-in.

The patch also modifies existing offending duplicate headings,
since multiple identical labels per file are not permitted.

Change-Id: I1ad56436a44b57a44bdeefe84214fd5074aa0ce4
Signed-off-by: Galanakis, Minos <minos.galanakis@arm.com>
diff --git a/docs/conf.py.in b/docs/conf.py.in
index bc79be7..4c5a740 100644
--- a/docs/conf.py.in
+++ b/docs/conf.py.in
@@ -57,8 +57,8 @@
 
 #Make auso section labals generated be prefixed with file name.
 autosectionlabel_prefix_document=True
-#Add auso section label for level 1 headers only.
-autosectionlabel_maxdepth=1
+#Add auso section label for level 2 headers only.
+autosectionlabel_maxdepth=2
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']