Fixed port range

Actual port range for ZMQ is 49152 through 65535.  Also fixed some grammar/spelling issues.

docs/source/notebook/public_server.rst

@@ -111,13 +111,13 @@ to ``https://your.host.com:9999`` with ``ipython notebook
 Firewall Setup
 ``````````````
 
-To function correctly, the firewall on computer running the ipython server must be 
+To function correctly, the firewall on the computer running the ipython server must be 
 configured to allow connections from client machines on the ``c.NotebookApp.port``
 port to allow connections to the web interface.  The firewall must also allow 
-connections from 127.0.0.1 on ports in the range of 10000 to 65535, which are used
-by the server to communicate with the notebook kernels.  The kernel communication
-ports are chosen randomly by ZeroMQ, and my require multiple connections per kernel
-so a large range of ports must be accessible.
+connections from 127.0.0.1 (localhost) on ports from 49152 to 65535.
+These ports are used by the server to communicate with the notebook kernels.  
+The kernel communication ports are chosen randomly by ZeroMQ, and may require 
+multiple connections per kernel, so a large range of ports must be accessible.
 
 Running with a different URL prefix
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