updates

git-svn-id: https://svn.r-project.org/R/trunk@66988 00db46b3-68df-0310-9c12-caf00c1e9a41
remove some frequently-changed URIs

git-svn-id: https://svn.r-project.org/R/trunk@66990 00db46b3-68df-0310-9c12-caf00c1e9a41