[Couchdb Wiki] Update of "Adding_Runtime_Statistics" by JanLehnardt

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The "Adding_Runtime_Statistics" page has been changed by JanLehnardt.
The comment on this change is: fix api.
http://wiki.apache.org/couchdb/Adding_Runtime_Statistics?action=diff&rev1=3&rev2=4

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  An absolute value counter is not really a counter, it collects absolute values for one second. They are good for collecting information like the amount of time spent in an event or the size of some piece of data.
  
  {{{
- couch_stats_collector:record({Module, Key}).
+ couch_stats_collector:record({Module, Key}, Value).
  }}}