Fix documentation entry for "sortedIndex" function
Fix documentation entry for "sortedIndex" function

Documentation for the `sortedIndex()` was at least ambiguous at this point, or even wrong, consider for example `let m = [ 1, 2, 4, 4, 4, 5, 6, 7 ];` array, if we are searching for `4`, like so: `_.sortedIndex(m, 4);`, it actually returns `2` which is a *smallest* index of 4 between all it's occurences, not simply the index found by binary search, at this point true binary search could return `3` instead of `2`. So, it is important to state explicitly in the documentation that the index returned is indeed *the smallest index*, as I corrected here. Please apply this update.
documentcloud/underscore,jashkenas/underscore,documentcloud/underscore,jashkenas/underscore