[Twisted-Python] Patch for thinko/typo in components howto

[Stephen C. Waterbury]

The CVS version is slightly different from what's on the web, but
both have this error.  (The one that's on the web additionally has the error
that "the method definitions inside the [Interface] class block do not 
have any
self parameters", but this has of course been fixed in CVS ...)

Steve.

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