Fix replSetStepDown example and use a more realistic number

even though 24 hours is still a bit too much

Signed-off-by: Sam Kleinman <samk@10gen.com>
fix DOCS-2281 typo
DOCS-2275: backup cost estimation faq
DOCS-2274: rsync trailing slash fix
DOCS-2273: fix weird link
DOCS-1966: Document virtual memory address limit

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1966 edits
minor: edit to virtual memory limitation
Small fix for database profiling

Signed-off-by: Sam Kleinman <samk@10gen.com>
db.getUser and db.getUsers