[Couchdb Wiki] Update of "Document_Update_Handlers" by AviFlax

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The "Document_Update_Handlers" page has been changed by AviFlax.
The comment on this change is: Added new TBD section, to list things which aren't clear, so we can work towards clarifying them..
http://wiki.apache.org/couchdb/Document_Update_Handlers?action=diff&rev1=8&rev2=9

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  This means that unlike document validators, the user's intent must be clear by calling this individual handler explicitly. In this sense, you should think about an ''_update'' handler as complementary to ''_show'' functions, not to ''validate_doc_update'' functions.
  
+ == TBD ==
+ 
+  * Is POST supported, or only PUT?
+    * Maybe we should support PATCH?
+  * Must fields be sent as URL query parameters, or can they be sent in the request representation?
+