Fix typos in "Observing Documents" section

There's a couple of typos in the "Observing Documents section. In one case, the word "timeout" should be two words (time out), and in the other the word "lease" should be "least."

This was found in the Couchbase Server 2.0 guide at: http://docs.couchbase.com/couchbase-devguide-2.0/?mkt_tok=3RkMMJWWfF9wsRoivanMZKXonjHpfsX64u8uWqawlMI%2F0ER3fOvrPUfGjI4FTsdrI%2BSLDwEYGJlv6SgFSbDHMadqw7gNWBU%3D#observing-documents

Please fix the typo in 2.0, and also check for and correct it in the 2.1, 2.2, and 2.5 guides if necessary.

I attached a picture with the typos circled, to help find it in the sections.