update heading depth of studio section, bundles subsection
update heading depth for studio -> documents section
Merge branch 'studio-documents' of git://github.com/dominiqueplante/docs

Conflicts:
	version_2_5/docs/studio/Bundles/Authorization.markdown
	version_2_5/docs/studio/Bundles/index.markdown
	version_2_5/docs/studio/Bundles/replication-walkthrough.markdown