Fix typos across the codebase (thanks codespell!)

tokio-xmpp/src/error.rs

@@ -23,7 +23,7 @@ pub enum Error {
     Auth(AuthError),
     /// Connection closed
     Disconnected,
-    /// Shoud never happen
+    /// Should never happen
     InvalidState,
     /// Fmt error
     Fmt(fmt::Error),

tokio-xmpp/src/xmpp_codec.rs

@@ -357,7 +357,7 @@ mod tests {
         });
     }
 
-    /// By default, encode() only get's a BytesMut that has 8kb space reserved.
+    /// By default, encode() only gets a BytesMut that has 8 KiB space reserved.
     #[test]
     fn test_large_stanza() {
         use futures::{executor::block_on, sink::SinkExt};