runtime: fix comment typos (#6143)

tokio/src/runtime/scheduler/multi_thread/worker.rs

@@ -789,7 +789,7 @@ impl Core {
             );
 
             // Take at least one task since the first task is returned directly
-            // and nto pushed onto the local queue.
+            // and not pushed onto the local queue.
             let n = usize::max(1, n);
 
             let mut synced = worker.handle.shared.synced.lock();

tokio/src/task/local.rs

@@ -1169,7 +1169,7 @@ mod tests {
     // Does a `LocalSet` running on a current-thread runtime...basically work?
     //
     // This duplicates a test in `tests/task_local_set.rs`, but because this is
-    // a lib test, it wil run under Miri, so this is necessary to catch stacked
+    // a lib test, it will run under Miri, so this is necessary to catch stacked
     // borrows violations in the `LocalSet` implementation.
     #[test]
     fn local_current_thread_scheduler() {

tokio/tests/rt_handle_block_on.rs

@@ -3,7 +3,7 @@
 
 // All io tests that deal with shutdown is currently ignored because there are known bugs in with
 // shutting down the io driver while concurrently registering new resources. See
-// https://github.com/tokio-rs/tokio/pull/3569#pullrequestreview-612703467 fo more details.
+// https://github.com/tokio-rs/tokio/pull/3569#pullrequestreview-612703467 for more details.
 //
 // When this has been fixed we want to re-enable these tests.