Entity: Document upsert methods #592
Description
I'm submitting a...
[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report
[ ] Feature request
[X] Documentation issue or request
What is the current behavior?
Expected behavior:
Minimal reproduction of the problem with instructions:
Version of affected browser(s),operating system(s), npm, node and ngrx:
Other information:
Add documentation for the newly added upsertOne and upsertMany methods once #550 lands