MLECO-2919: Improvements for documentation.

Corrections and improvements in the build graph (documentation).

Change-Id: Ic7f9afe587978f835a88109c21a4145b91daf45d
diff --git a/docs/media/build_graph.png b/docs/media/build_graph.png
index 198216e..76f4a40 100644
--- a/docs/media/build_graph.png
+++ b/docs/media/build_graph.png
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