misc: Fix spelling issues

Misspellings were identified by:
  https://github.com/marketplace/actions/check-spelling

* Initial corrections based on forbidden patterns from the action
* Additional corrections by Google Chrome auto-suggest
* Some manual corrections
* Adding markdown bullets to readme credits section

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

virtio-devices/src/vsock/packet.rs

@@ -141,7 +141,7 @@ impl VsockPacket {
             buf_size: 0,
         };
 
-        // No point looking for a data/buffer descriptor, if the packet is zero-lengthed.
+        // No point looking for a data/buffer descriptor, if the packet is zero-length.
         if pkt.is_empty() {
             return Ok(pkt);
         }