vendor branches: small mistake in docs

From http://svnbook.red-bean.com/en/1.1/ch07s05.html ...
"After replacing the 1.0 code with 1.1 code, svn status will show files with
local modifications as well as, perhaps, some unversioned or missing files."

While unversioned files may exist, there will be no missing files.

--
Adam Monsen
http://adammonsen.com/blog/