Hello! The documentation for git-rm at http://www.kernel.org/pub/software/scm/git/docs/git-rm.html says
EXAMPLES
git-rm Documentation/\*.txt
Removes all *.txt files from the index that are under the Documentation directory and any of its subdirectories. The files are not removed from the working tree.
I think that this should say
git-rm --cached Documentation/\*.txt
?
Otherwise I don't see why it wouldn't remove the files from the working tree. If this is a documentation error, it could cause some bad problems for people who follow it.