Remove reference to term "accumulator" #773
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As I understand it, the term "accumulator" is typically used to refer, not to the combining function f, but to the first argument of the function.
The reducer function f takes the current value of the accumulator and returns the updated value.
When reading this excellent guide coming from a Clojure background, the use of accumulator in the text struck me as confusing.
Reference for the (I think) typical use of "accumulator": https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce