Fix tutorial typos

content/tokio/tutorial/channels.md

@@ -271,7 +271,7 @@ let t2 = tokio::spawn(async move {
     tx2.send(cmd).await.unwrap();
 });
 # }
-````
+```
 
 At the bottom of the `main` function, we `.await` the join handles to ensure the
 commands fully complete before the process exits.

content/tokio/tutorial/framing.md

@@ -180,7 +180,7 @@ pub async fn read_frame(&mut self)
 Let's break this down. The `read_frame` method operates in a loop. First,
 `self.parse_frame()` is called. This will attempt to parse a redis frame from
 `self.buffer`. If there is enough data to parse a frame, the frame is returned
-to the caller of `read_frame()`.Otherwise, we attempt to read more data from the
+to the caller of `read_frame()`. Otherwise, we attempt to read more data from the
 socket into the buffer. After reading more data, `parse_frame()` is called
 again. This time, if enough data has been received, parsing may succeed.
 
@@ -464,9 +464,7 @@ async fn write_frame(&mut self, frame: &Frame)
         Frame::Array(_val) => unimplemented!(),
     }
 
-    self.stream.flush().await;
-
-    Ok(())
+    self.stream.flush().await
 }
 # async fn write_decimal(&mut self, val: u64) -> io::Result<()> { unimplemented!() }
 # }
@@ -488,7 +486,7 @@ in the buffer to the socket.
 
 Another alternative would be to **not** call `flush()` in `write_frame()`.
 Instead, provide a `flush()` function on `Connection`. This would allow the
-caller to write queue multiple small frames in the write buffer then write them
+caller to queue multiple small frames in the write buffer then write them
 all to the socket with one `write` syscall. Doing this complicates the
 `Connection` API. Simplicity is one of Mini-Redis' goals, so we decided to
 include the `flush().await` call in `fn write_frame()`.

content/tokio/tutorial/spawning.md

@@ -225,7 +225,7 @@ note: function requires argument type to outlive `'static`
   |
 7 |       task::spawn(async {
   |  _________________^
-8 | |         println!("Here's a vector: {:?}", v);
+8 | |         println!("Here's a vec: {:?}", v);
 9 | |     });
   | |_____^
 help: to force the async block to take ownership of `v` (and any other