[DOC release] Fix doc for `diffArray`
[DOC release] Fix doc for `diffArray`

- Fix method name from `diff-array` to `diffArray`
- This is not a public method

HeroicEric/data,swarmbox/data,workmanw/data,swarmbox/data,davidpett/data,davidpett/data,arenoir/data,davidpett/data,arenoir/data,workmanw/data,workmanw/data,HeroicEric/data,HeroicEric/data,davidpett/data,arenoir/data,HeroicEric/data,swarmbox/data,swarmbox/data,workmanw/data,arenoir/data