[Couchdb Wiki] Update of "Built-In_Reduce_Functions" by SebastianCohnen

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The "Built-In_Reduce_Functions" page has been changed by SebastianCohnen.
The comment on this change is: added a note about whitespaces.
http://wiki.apache.org/couchdb/Built-In_Reduce_Functions?action=diff&rev1=2&rev2=3

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  Currently (CouchDB 0.11.0) there are three built-in reduce functions. Built-in reduce functions are performed right inside CouchDB implemented in Erlang. In most cases it is very fast because they are way more efficient.
  
  == Usage ==
- To use built-in reduce functions, you simply need to replace your reduce function with {{{_count}}}, {{{_sum}}} or {{{_stats}}}.
+ To use built-in reduce functions, you simply need to replace your reduce function with a string containing {{{_count}}}, {{{_sum}}} or {{{_stats}}} (without any preceding or tailing whitespace).
  
  Here is an example design document using build-in reduce functions:
  {{{