Misnamed function in Entity

[karptonite]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report  
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request

In the documentation for the forthcoming @ngrx/entity adapter, the createEntityAdapter function is said to take a sort function, but the example given shows it taking a compareFunction, in the form that is usually passed to a sort method. If the intention is that this should be a compare function, it should probably be renamed to avoid confusion.