add notes

git-svn-id: https://svn.r-project.org/R/trunk@67063 00db46b3-68df-0310-9c12-caf00c1e9a41
remove need for Rzlib.dll

git-svn-id: https://svn.r-project.org/R/trunk@67065 00db46b3-68df-0310-9c12-caf00c1e9a41
loadNamespace required 3 component versionCheck list.

git-svn-id: https://svn.r-project.org/R/trunk@67066 00db46b3-68df-0310-9c12-caf00c1e9a41
typo

git-svn-id: https://svn.r-project.org/R/trunk@67068 00db46b3-68df-0310-9c12-caf00c1e9a41