a drop "column" example using $unset
minor: fixing rst problem
merge: @danilobellini changes to sql to mongodb examples table
Merge branch 'master' of git://github.com/danilobellini/docs-mongodb
DOCS-1314 remove reference to --rest option for mongos

Signed-off-by: Sam Kleinman <samk@10gen.com>
Fixed typo (comma to period).

Fixed typo where a comma was used instead of a period.

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1298: objectid sorting
DOCS-1262 DOCS-1263 DOCS-1264 new access control

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1262 DOCS-1263 DOCS-1264 edits
DOCS-1278 limit option can be used instead of num