[Couchdb Wiki] Update of "Reserved_words" by EthanFremen

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The "Reserved_words" page has been changed by EthanFremen:
http://wiki.apache.org/couchdb/Reserved_words?action=diff&rev1=2&rev2=3

  This document details item names that have a special system meaning. It also details recommended item names which are not enforced by the system, but may help interoperability of databases if consistent names are used.
  
  == Reserved Item Names ==
- System reserved items start with underscore, the other items listed are conventions.
+ System reserved items start with underscore, the other items listed are conventions. 
+ CouchDb does not allow any user-defined property to begin with an underscore.
  === _id ===
  this is the unique ID of the document
  === _rev ===
  This is the revision reference of the document
+ === _attachments ===
+ This is an array of attachments on the document.
+ 
  
  
  = Proposals =