templatefilters: fix doc of basename() os.path.basename() does NOT strip trailing slashes. > Note that the result of this function is different from the Unix basename > program; where basename for '/foo/bar/' returns 'bar', the basename() > function returns an empty string (''). https://docs.python.org/2.7/library/os.path.html#os.path.basename

identify: document -r. explicitly how to disable wdir scanning (issue5622)

lfs: add a comment to describe subtle local blobstore open() behavior