fix(_internal/utils/filesystem): Update comment for catched exception
This fixes
@@ -138,6 +138,8 @@ def _test_writable_dir_win(path):
# This could be because there's a directory with the same name.
# But it's highly unlikely there's a directory called that,
# so we'll assume it's because the parent dir is not writable.
+ # This could as well be because the parent dir is not readable,
+ # due to non-privileged user access.
return False
raise
else:
