Fix typo in docstring for var (#35)

Author: briochemc

src/Statistics.jl

@@ -344,7 +344,7 @@ Compute the sample variance of collection `itr`.
 The algorithm returns an estimator of the generative distribution's variance
 under the assumption that each entry of `itr` is an IID drawn from that generative
 distribution. For arrays, this computation is equivalent to calculating
-`sum((itr .- mean(itr)).^2) / (length(itr) - 1)).
+`sum((itr .- mean(itr)).^2) / (length(itr) - 1))`.
 If `corrected` is `true`, then the sum is scaled with `n-1`,
 whereas the sum is scaled with `n` if `corrected` is
 `false` with `n` the number of elements in `itr`.