ReadFixed and WriteFixed descriptions

[connortsui20]

https://docs.rs/io-uring/latest/io_uring/opcode/struct.ReadFixed.html

Read from pre-mapped buffers that have been previously registered...

Should this be "Read into pre-mapped buffers" instead of "Read from"?

https://docs.rs/io-uring/latest/io_uring/opcode/struct.WriteFixed.html

Write to pre-mapped buffers that have been previously registered...

Also, should this be "Write from pre-mapped buffers" instead of "Write to"?

I'm pretty sure this is the case, but not 100% sure.

[quininer]

You are right, would you like to open a PR to fix it?

[connortsui20]

Sure!

It would probably be good for me to take the time to add some more specific documentation that isn't just pointing to man pages. Hopefully I can get those done next month (when my school semester has finished)