zeroconf: small fixes in docstring
Use reST role for consistency, import small part of Debian's
proposed_upstream__correct-zeroconf-doc patch from
http://svn.debian.org/viewsvn/python-apps/packages/mercurial/trunk/debian/patches/
#!/bin/sh
# test dirstate._dirs refcounting
hg init t
cd t
mkdir -p a/b/c/d
touch a/b/c/d/x
touch a/b/c/d/y
touch a/b/c/d/z
hg ci -Am m
hg mv a z