docs(ffi): copy-paste error

[divergentdave]

The docs for hyper_waker_wake were accidentally copied over from hyper_waker_free, so I rewrote it.

[seanmonstar]

Oh, thanks for catching this! I added a note suggestion too.

[seanmonstar]

Ah, this will also need to update the hyper.h file to make CI happy... I can check it out locally and run the script.

[divergentdave]

I got it, I added the note and re-generated the C header.

[seanmonstar]

Oh nice, thanks!