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

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The "Built-In_Reduce_Functions" page has been changed by RaulSierra:
http://wiki.apache.org/couchdb/Built-In_Reduce_Functions?action=diff&rev1=3&rev2=4

Comment:
sumsqr is the sum over all squares, not square roots

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- {{{sum}}} and {{{count}}} is the equiverlent to {{{_sum}}} and {{{_count}}}. {{{min}}} and {{{max}}} are the minimum and maximum values of the emitted values. {{{sumsqr}}} is the sum over all square roots of the emitted values (useful for statistics calculations).
+ {{{sum}}} and {{{count}}} is the equiverlent to {{{_sum}}} and {{{_count}}}. {{{min}}} and {{{max}}} are the minimum and maximum values of the emitted values. {{{sumsqr}}} is the sum over all squares of the emitted values (useful for statistics calculations).