Multicast documentation is misleading

New submission from itamar <[email protected]>:

1. The client example in the multicast docs doesn't really explain that it will not be able to receive multicast messages, only send them. The second example should therefore probably also have a joinGroup() in the example.

2. The server example shows replying via UDP, rather than multicast. There should be some explanation about how it's possible to do both.

3. The comment in the server example about doing .join() may be wrong, it should probably also be a joinGroup().

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Type     : defect
Component: core
Keywords : documentation, easy
Priority : normal
Nosy     : 
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http://twistedmatrix.com/trac/ticket/4262