Links from 2.0 release to 1.8 or older SDK

Here a list of links of the Developer Guide that are pointing to the previous release of the product:

• 3.5. Storing Information
  > Last line of this chapter : "see Couchbase Manual, Sizing Guidelines." pointing to :
  it should be http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase-bestpractice-sizing.html

• 7.5.5. Maintaining Persistent Connections
  we should probably point to the lastest version of the SDKs doc (1.1 instead of 1.0)

Open question:

• when logging doc bug (links, typos, ...) do you want me to create 1 issue with a list of error or 1 issue by error.