clean up the two as.dendrogram.hclust (check)  entries


git-svn-id: https://svn.r-project.org/R/trunk@66884 00db46b3-68df-0310-9c12-caf00c1e9a41
update docs

git-svn-id: https://svn.r-project.org/R/trunk@66885 00db46b3-68df-0310-9c12-caf00c1e9a41