truncate() definition doesn't match the non-normative text

[jesup]

The text for truncate() on a WritableFileStream doesn't match the non-normative text, such as the discussion of the cursor position.

[a-sully]

The text for truncate()

Are you talking about the algorithm? (https://fs.spec.whatwg.org/#:~:text=The%20truncate(size,Return%20result) If so, the same issue (of not updating the cursor) also applies to write()

[jesup]

Yes. And as you note, there are a bunch of mentions of the cursor in the non-normative text, but 0 references to cursor in the normative text

[dslee414]

Closing in factor of #77