DOCS-1844: split chunk docs have incorrect syntax for hashed shard keys

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1844: edits
DOCS-1315: Document log rotation strategies

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1315: edits
Fix typo in broadcast discussion, clarify.

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1871 best practices for naming config servers