Correct the documentation for the zeroconf extension.

--- a/hgext/zeroconf/__init__.py
+++ b/hgext/zeroconf/__init__.py
@@ -7,9 +7,9 @@
 
 '''discover and advertise repositories on the local network
 
-Zeroconf enabled repositories will be announced in a network without
-the need to configure a server or a service. They can be discovered
-without knowing their actual IP address.
+The zeroconf extension will advertise "hg serve" instances over DNS-SD so
+that they can be discovered using the "hg paths" command without knowing
+the server's address.
 
 To allow other people to discover your repository using run "hg serve"
 in your repository::
@@ -17,7 +17,7 @@
   $ 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