Spelling fixes in comments (#508)

src/proto/streams/prioritize.rs

@@ -18,7 +18,7 @@ use std::{cmp, fmt, mem};
 /// This is because "idle" stream IDs – those which have been initiated but
 /// have yet to receive frames – will be implicitly closed on receipt of a
 /// frame on a higher stream ID. If these queues was not ordered by stream
-/// IDs, some mechanism would be necessary to ensure that the lowest-numberedh]
+/// IDs, some mechanism would be necessary to ensure that the lowest-numbered]
 /// idle stream is opened first.
 #[derive(Debug)]
 pub(super) struct Prioritize {

src/proto/streams/recv.rs

@@ -54,7 +54,7 @@ pub(super) struct Recv {
     /// Refused StreamId, this represents a frame that must be sent out.
     refused: Option<StreamId>,
 
-    /// If push promises are allowed to be recevied.
+    /// If push promises are allowed to be received.
     is_push_enabled: bool,
 }