Description
$isolates just means that once a multi-update has written, it can no longer yield. I started to clean things up to make that clear but more work may be needed.
commits so far:
https://github.com/mongodb/docs/commit/23c09c2950114a4af0a73090b21cc9558bb2fac3
https://github.com/mongodb/docs/commit/6b714209d73d35aca026c7b13715e1305b2ec9b7
This will change significantly in 2.8 so these edits are most important for 2.2/4/6