Commits on Aug 22, 2023

1. Improve UdpSocket documentation …

   I tried working with `UdpSocket` and ran into `EINVAL` errors with no
   clear indication of what causes the error. Also, it was uncharacteristically
   hard to figure this module out, compared to other Rust `std` modules.
   
   1. `send` and `send_to` return a `usize`
   This one is just clarity. Usually, returned `usize`s indicate that the
   buffer might have only been sent partially. This is not the case with
   UDP. Since that `usize` must always be `buffer.len()`, I have documented
   that.
   
   2. `bind` limits `connect` and `send_to`
   When you bind to a limited address space like localhost, you can only
   `connect` to addresses in that same address space. Error kind:
   `AddrNotAvailable`.
   
   3. `connect`ing to localhost locks you to localhost
   On Linux, if you first `connect` to localhost, subsequent `connect`s to
   non-localhost addresses fail. Error kind: `InvalidInput`.
   
   Co-authored-by: Jubilee <[email protected]>

   

   Patiga and workingjubilee committed Aug 22, 2023
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