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>
5 files changed