pure cosmetic (white space; comment)

git-svn-id: https://svn.r-project.org/R/trunk@66468 00db46b3-68df-0310-9c12-caf00c1e9a41
printing of list component (and slot) names with "\"

git-svn-id: https://svn.r-project.org/R/trunk@66469 00db46b3-68df-0310-9c12-caf00c1e9a41