fix(#2377): doc_markdown + too_many_lines clippy lints

- Backtick-quote `pull_request` in doc comments (4x doc_markdown)
- Add #[allow(clippy::too_many_lines)] to server::dispatch (101/100;
  +1 line from submit_kind fetched_sha param in 5dd0a36f)

hive-c0re/src/server.rs

@@ -74,6 +74,7 @@ async fn handle(stream: UnixStream, coord: Arc<Coordinator>) -> Result<()> {
     }
 }
 
+#[allow(clippy::too_many_lines)]
 async fn dispatch(req: &HostRequest, coord: Arc<Coordinator>) -> HostResponse {
     let result: anyhow::Result<HostResponse> = async {
         Ok(match req {