Documentation: Describe recommonmark's auto_toc_tree

Explain recommonmark's auto_toc_tree and give an example to make writing
documentation easier. Show an example what happens if the document
isn't included in any toctree.

Change-Id: I4938d8d292ea890caec6d396b4fa04da65e398f4
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/28427
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tom Hiller <thrilleratplay@gmail.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

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