zeroconf: use reST syntax for literal blocks

hgext/zeroconf/__init__.py

@@ -12,15 +12,15 b' to configure a server or a service. They'
 their actual IP address.
 
 To allow other people to discover your repository using run "hg serve" in your
-repository.
+repository::
 
- $ cd test
- $ hg serve
+  $ cd test
+  $ hg serve
 
-You can discover zeroconf enabled repositories by running "hg paths".
+You can discover zeroconf enabled repositories by running "hg paths"::
 
- $ hg paths
- zc-test = http://example.com:8000/test
+  $ hg paths
+  zc-test = http://example.com:8000/test
 '''
 
 import Zeroconf, socket, time, os