OAK-781: Clarify / fix effects of MISSING_NODE as base state of NodeBuilder
wording: use linked instead of connected to prevent confusion with the isConnected method

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1471386 13f79535-47bb-0310-9956-ffa450edef68
OAK-781: Clarify / fix effects of MISSING_NODE as base state of NodeBuilder
lower visibility of internal methods

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1471387 13f79535-47bb-0310-9956-ffa450edef68