Minor: correction on markup

Signed-off-by: Sam Kleinman <samk@10gen.com>
Minor: Colon to show a example of commands sequence

Signed-off-by: Sam Kleinman <samk@10gen.com>
Prefer to use MongoClient instead of Connection class in PyMongo

Signed-off-by: Sam Kleinman <samk@10gen.com>
Refering to PyMongo's ReadPreference class

Signed-off-by: Sam Kleinman <samk@10gen.com>
MongoClient instead of Connection in PyMongo at a use case

Signed-off-by: Sam Kleinman <samk@10gen.com>