Minor typo: missing space blank

Signed-off-by: Sam Kleinman <samk@10gen.com>
Fix broken links in `CONTRIBUTING.rst'.

Use URLs from `README.rst' that link to `docs.mongodb.org'.

Signed-off-by: Sam Kleinman <samk@10gen.com>
Typo fix 'log' -> 'long'

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