chore(lib): fix some typos in comments (#3739)

Signed-off-by: friendlyping <friendlyping@icloud.com>

Author: friendlyping

src/client/dispatch.rs

@@ -18,7 +18,7 @@ pub(crate) type Promise<T> = oneshot::Receiver<Result<T, crate::Error>>;
 
 /// An error when calling `try_send_request`.
 ///
-/// There is a possibility of an error occuring on a connection in-between the
+/// There is a possibility of an error occurring on a connection in-between the
 /// time that a request is queued and when it is actually written to the IO
 /// transport. If that happens, it is safe to return the request back to the
 /// caller, as it was never fully sent.

src/ext/mod.rs

@@ -192,7 +192,7 @@ impl OriginalHeaderOrder {
     }
 
     // No doc test is run here because `RUSTFLAGS='--cfg hyper_unstable_ffi'`
-    // is needed to compile. Once ffi is stablized `no_run` should be removed
+    // is needed to compile. Once ffi is stabilized `no_run` should be removed
     // here.
     /// This returns an iterator that provides header names and indexes
     /// in the original order received.

src/proto/h2/client.rs

@@ -722,7 +722,7 @@ where
                 }
 
                 Poll::Pending => match ready!(Pin::new(&mut self.conn_eof).poll(cx)) {
-                    // As of Rust 1.82, this pattern is no longer needed, and emits a waring.
+                    // As of Rust 1.82, this pattern is no longer needed, and emits a warning.
                     // But we cannot remove it as long as MSRV is less than that.
                     #[allow(unused)]
                     Ok(never) => match never {},