[Couchdb Wiki] Update of "Formatting_with_Show_and_List" by JamesHowe

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The "Formatting_with_Show_and_List" page has been changed by JamesHowe.
The comment on this change is: clarification.
http://wiki.apache.org/couchdb/Formatting_with_Show_and_List?action=diff&rev1=25&rev2=26

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  == Listing Views with CouchDB 0.9 ==
- List functions were introduced in CouchDB 0.9 and had different, more complex API:
+ List functions were introduced in CouchDB 0.9 and had different, more complex API. This API is no longer available after 0.10.
  
  A list function has a more interesting signature, as it is passed the head of the view on first invocation, then each row in turn, then called one more time for the tail of the view. The function should check the `head` and `row` parameters to identify which state it's being called in; the sequence of calls to `listfn`, for a view with three rows, would look like: