getting_oe.xml: Update documentation.
getting_oe.xml: Update documentation.

* New section about directory structure.
 * Update 'Getting BitBake' section.

Resubmitted against .dev instead of .documentation.

Signed-off-by: Theodore A. Roth <e5f7a2f54926057afb57422361929a1c549e12fb@gmail.com>

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