added HierarchyRules example to docs
added HierarchyRules example to docs

couchbaselabs/cbft,couchbaselabs/cbft,couchbaselabs/cbgt,nimishzynga/cbgt,couchbaselabs/cbft,couchbaselabs/cbft,nimishzynga/cbgt,couchbaselabs/cbgt,nimishzynga/cbgt,steveyen/cbft,couchbaselabs/cbgt,nimishzynga/cbgt,steveyen/cbft,couchbaselabs/cbgt,steveyen/cbft,steveyen/cbft,steveyen/cbft