toc: fixing composite reference tables
rebranding: mongodb
edits to release notes
minor: build fix
Fix typo in secondaryThrottle update code

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1870: fixing redirect
DOCS-1869: adding clarification about structure of tutorials.
DOCS-1869 adding document to tutorial landing page
DOCS-94 DOCS-95 migrate sharded cluster to new hardware