[DOCS]: Clarify behavior of onConflictDoX when inserting multiple values at once

### Enhancement hasn't been filed before.

- [x] I have verified this enhancement I'm about to request hasn't been suggested before.

### Describe the enhancement you want to request

The docs currently suggest that the `onConflictDoNothing` method "cancels the insert" when a conflict is found - but the docs only include examples for single insert - not multiple value inserts.

Does this mean that if I am inserting a batch of 100 records and one of them has a conflict, the entire insert (of all 100 records) is canceled? Or do the other 99 still get inserted?

E.g.
```ts
await db.insert(table)
.values(arrayOf100ValuesWithOneConflict)
.onConflictDoNothing()

// Do 99 or 0 records get inserted? - Docs should mention this
```

I suggest updating the docs to clarify what the behavior is.

Edit: Based on quick, rough testing, it appears that the entire batch of inserts is cancelled if there are any conflicts within the batch - would be nice to have this explicitly stated in the docs.