minor: updating formating of cluster backup with mongodump
Update diagnostics.txt

grammar fix

Signed-off-by: Sam Kleinman <samk@10gen.com>
minor: cleanup artifacts
DOCS-2605: clarify organization of db.collection.remove
DOCS-2527: ttlMonitorEnabled documentation
DOCS-2579: slight reorganization of security tutorials
DOCS-2502 new runtime option format: shared options