[Couchdb Wiki] Trivial Update of "Security_Features_Overview" by StephaneAlnet

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The "Security_Features_Overview" page has been changed by StephaneAlnet:
http://wiki.apache.org/couchdb/Security_Features_Overview?action=diff&rev1=24&rev2=25

Comment:
Split the section that describes _users

   1. There are one or more server admins configured:
    1. ''require_valid_user'' is set to false: the request will be validated as "anonymous" (unnamed user, no roles)
    1. ''require_valid_user'' is set to true: if none of the configured authentication handlers succeeds, an HTTP message with error code 401 (unauthorized) will be sent back to the requester
+ 
+ 
+ == Authentication database ==
+ 
+ The authentication database is a system database called `_users`.
  
  Currently the documents in the authentication database can only have the type attribute set to "user". Such documents have the following structure: