I am looking at version v7.0. Please check also past and future versions.

Inaccuracy 1:  resumeAfter: <int>

'resumeAfter' expects a resume token, so the type should be <document> similar to 'startAfter'.

Inaccuracy 2: resumeAfter and startAfter have the same description; the difference between the two options is unclear.

mongosh db.collection.watch() documentation does a bit better job:

 ** https://www.mongodb.com/docs/manual/reference/method/db.collection.watch/#mongodb-method-db.collection.watch

Namely, 'resumeAfter' will fail while using the resume token of the 'invalidate' event, whilst 'startAfter' succeed.