Update information on Unix-like binaries.

git-svn-id: https://svn.r-project.org/R/trunk@66201 00db46b3-68df-0310-9c12-caf00c1e9a41
Typo.

git-svn-id: https://svn.r-project.org/R/trunk@66202 00db46b3-68df-0310-9c12-caf00c1e9a41